GB/T 5691-1985 Modular instrument system for data processing CAMAC system

This standard specifies a modular instrument system that enables sensors and other equipment to be connected to digital control devices or computers. This standard includes mechanical standards and signal standards that are sufficient to ensure that units designed and manufactured from different sources are compatible with each other. This standard is applicable to nuclear instruments, but it can also be used for other applications. Subsequent CAMAC standards will show the breadth of its applicability. As a reactor instrument and control system, other nuclear electronic instrument assembly equipment can also be used. GB/T 5691-1985 Modular instrument system CAMAC system for data processing GB/T5691-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
A modular instrumentation system for data handlingCAMAC system
1 Introduction
UDC 621.317.39
:21.38.084
CB 569185
IEC 516-1975
1.1 This standard is equivalent to the international standard IEC516 (1975) "Modular instrumentation system for data handling: CAMAC system" 1.2 This standard makes the following editorial changes to IEC516: a. Added 1.1 and 1.2 in the "Foreword". 1.3 * is the original content of IEC516. b. The provisions that must be followed in the original text of IEC516 are indicated by boldface, and in this standard, they are indicated by thin solid lines under the provisions. c. The words "(U=44.45mm)" in 4.1.3 of the original IEC516 are moved to 4.1.1 in this standard and are no longer written in 4.1.3.
d. The arrangement format, number writing, drawing tables, punctuation marks and writing of "notes" in chapters, clauses, clauses and items in this standard, which are different from GB1.1-81 "General Provisions for the Preparation of Standards for Standardization Work Guidelines", shall be written in accordance with the provisions of GB1.1.
1.3 This standard specifies a modular instrument system that enables sensors and other equipment to be connected to digital control devices or computers. This standard includes mechanical standards and signal standards that are sufficient to ensure that components from different designs and manufacturing sources are compatible with each other. The basic features of CAMAC are summarized as follows:
8. It is a modular system with various functional units that can be combined into instrument devices. h. These functional units are made into plug-ins and installed in standard chassis. c. The mechanical structure is designed so that high density packing of integrated circuits and similar devices can be achieved. d. The card is connected to a standard chassis data path. The chassis data path is a component of the chassis through which data, control signals and power are transmitted. The chassis data path standard is independent of the model of the card or the computer used. e. The system is designed so that the device composed of the chassis and the card can be connected to an online digital computer. However, whether a computer is used or not is completely arbitrary, and no part of this specification is related to the presence or absence of a computer in the system. 1. External connections to the components may comply with the digital or analog signal standards of relevant sensors, computers, etc. or with the digital signal requirements specified in this standard.
B Several CAMAC chassis (up to 7) can be interconnected through CAMAC branch information highways. For the compatibility requirements of the CAMAC specification, any equipment or system must comply with the mandatory provisions (see 3.1) 2 Scope
This standard is applicable to nuclear instrumentation, but it can also be used for other applications. Subsequent CAMAC standards will show the wide range of its applicability. As reactor instruments and control systems, other nuclear power equipment may also be used. 2.1 This standard applies to systems composed of modular electronic instrument units, which are used for input, transmission, and data processing, and are usually formed in conjunction with public control equipment, computers or other automatic data processing systems. * No "1.3" is included before the introduction of IE 16. National Standard Issued on December 4, 1985. Implementation on October 1, 1986. GB5691--85. 2.2 This standard applies to word serial transmission. This word serial transmission includes parallel transmission of up to 24 bits (constituting one word) between a data source and a data receiver. 2.3 This standard does not involve the characteristics, features or requirements of the public control equipment, computers or other automatic data processing machines connected to the system, but only involves aspects that affect the interface operation of these units. 3 Terminology
3.1 Explanation of this standard
Any clause that specifies that the system must comply with is indicated by a thin solid line below it*, usually with the word "must". The word "should" indicates a recommended or preferred method that should be followed unless there are sufficient reasons to oppose it. The word "may" indicates a permitted method that allows the designer to choose freely. 3.2 Definition of "module" and "controller" In this standard, "module" and "controller" are collectively referred to as plug-ins. The controller works on the chassis control station (see 4.4) and at least one ordinary station, and complies with the corresponding provisions in Table 1** when using each line of the chassis data path. The module is inserted into one or more ordinary stations in the chassis and complies with the corresponding provisions in Table 1 when using each line of the chassis data path. Table 1 Provisions for modules and controllers when using chassis data routes*** Line
, use instructions:
is written in black in IEC515.
*Double reverse
After E516 is the following table"
Quality*Instructions:
Mold mixing use
Receive signal
Receive signal
Receive signal
Connect pier repair number
Generate signal
Connect signal
Generate signal
Generate signal
Receive signal
Receive signal
Dust generation signal
Receive signal
Controller use
Generate signal
Generate signal
Generate signal
Receive signal
Generate signal
Receive signal
Receive signal
Generate signal
Generate signal
4 Mechanical features:
GB 5691-85
CAMAC is a modular system that creates an instrument enclosure by inserting appropriate plug-ins into a standard chassis. Each plug-in occupies one or more mounting stations in the chassis. Each station has an 86-way connector socket that plugs into the chassis data path. The chassis data path is an information path that is part of the chassis and consists primarily of data, control, and power buses. The manufacturing drawings for CAMAC compatible chassis and plug-ins can be designed based on the dimensions specified in the relevant illustrations, Figures 1 to 3 on pages 47 to 44 for chassis, Figure 4 on page 50 for plug-ins, and Figure 5 on page 51 for chassis data path connector grips and sockets. Recommended dimensions for chassis with ventilation, VIM adapters, and printed circuit boards for plug-ins are given in Figures 6 to 8 on pages 52 to 54, respectively, but are not mandatory. The dimensions in these figures are in millimeters unless otherwise noted. 4.1 Chassis
The chassis is installed in a standard 19in rack. There are up to 25 stations for plug-ins in the chassis. The spacing between adjacent stations is 17.2mm. Each station has upper and lower rails. Plug-ins can be loaded and unloaded from the chassis by sliding the frame edge and lower rails. There is also an 86-way chassis data line connector and screw holes for fixing screws. The standard C.AMAC module described in 4.2 is the international standard IEC482 "Electronic Instrumentation The C-type (CAMAC) module in the "Dimensions of Panels and Racks (for Nuclear Power Instruments)" is also included. In addition, the N-type (NIM) module in this standard can also be installed in the chassis. The spacing of the N-type module is 34.4mm (see 4.3). Unless otherwise specified, all chassis must comply with the provisions of Figures 1 to 3, including the provisions of the connector plug-in section in Figure 5. 4.1.1 to 4.1.2 are explanations of these figures. 4.1.1 Dimensions Figure 1 is a front view of a basic 25-station chassis. It has a minimum height, which is equivalent to the 5U (U=44.45mm)* dimension in the international standard IEC297 "Dimensions of Panels and Racks (for Nuclear Power Instruments)". The chassis can have less than 25 stations, as indicated by "Note ③" in the figure, and it does not have to be symmetrically configured. There are ISOM4, pitch 0.The UNC6-7 screw holes are for the CAMAC fixing screws. The UNC6-32 screw holes in the middle are for the lower fixing screws of the NIM unit. There may also be holes for the NIM unit on the upper crossbeam of the chassis. The screw holes for the FCAMA and NIM units and the positions of the screw holes at the edge of the chassis front opening are given by the Z and W dimension formulas in Figure 1. The center of the guide rail relative to the left edge of the chassis front opening can be placed, and the dimension formula is given in Figure 1. Detail A shows the entrance to the guide rail, and the dimensions of the entry end are not specified. Detail B gives the dimensions and positioning distances of the mounting holes, which meet the requirements of IEC297. Figure 2 is a top view of the lower rail of the chassis. In order to dissipate the heat generated by the components, it is necessary to provide sufficient ventilation through the bottom and top of the chassis. The unobstructed area between adjacent rails at the top and bottom of the chassis shall not be less than 5cm and shall be distributed between the front crossbeam of the chassis and the data path device of the chassis. If the chassis (height) shown in Figure 1 is placed above or below other equipment (including other similar machines), it is necessary to ensure sufficient ventilation by means of air guides. Another method is to expand the fence and carry additional ventilation devices as described in Section 4.1.3. Figure 3 is a side view along the line through the center of the upper rail and the ventilation gap of the lower rail in Figure 1. The front faces of the upper crossbeam and the lower crossbeam constitute the vertical reference plane of the chassis, which is behind the front face of the chassis. , the distance between them is e, and the typical value is between 3mm and 4mm. Therefore, the panel of the plug-in will not protrude beyond the front face of the chassis. The back of the chassis installation flange coincides with the reference line of the tube, but it is not necessary.
After the front ends of the upper and lower guide rails are exposed in the vertical plane, the guide rails should extend to a sufficient depth at the rear to ensure that the connector plug of the plug-in is guided into the entrance of the exposed socket. ★ Depth description
This 2 (=44.45m3 is in IFC5[6 in 4.1.3. GB5691-85
specifies the minimum size of the total depth of the chassis in order to provide mechanical protection for the data circuit devices in the chassis. It is also used for the rack where the chassis is placed. There are standard slide rails to support the chassis, so the height of the side panel of the chassis is smaller than the height of the front face of the chassis ( See the dimensions in Figures 1, 3 and 6) to facilitate the installation of the chassis into the rack. This reduced height area should extend to the rear end face near the chassis mounting flange, with a distance of no more than 25 mm.
The sliding surface of the lower guide rail constitutes the horizontal reference plane of the chassis. The chassis data line device is not allowed to be higher than 135 mm above the horizontal reference plane. In this way, there is an unobstructed path to the upper rear part of the plug-in. The position of the connector is determined relative to the three reference lines of the chassis. The center line of the socket is determined by the dimension relative to the left edge of the front opening in Figure 1; the vertical reference is shown in Figures 2 and 3 for the vertical reference plane of the chassis: the horizontal reference of the socket is shown in Figure 3 relative to the horizontal reference plane of the chassis. 4.1.2 Chassis data line connector skirt||tt| The data circuit connector socket has two rows of 43 contacts, with a pitch of 2.54 mm (0.1 in). Figure 5 shows the dimensions and recommended dimensions that must be followed by the connector and the common dimensions that serve as the basis for the design of the chassis and chassis data circuit devices. The vertical reference plane of the connector socket is the nominal position of the front end of the connector plug when the plug is fully inserted into the chassis. The basic functional characteristic dimensions of the socket related to the vertical reference plane are specified in Figure 5.5. In some sockets used, its mounting plane usually coincides with the vertical reference plane of the connector socket, but this is not necessary. The maximum dimension of the connector socket protruding forward of the vertical reference is marked in Figure 5.5. The shape of the straight or curved chamfers that allow the connector plug to be introduced into the socket are shown in Figures 5.6, 5.7 and 5.8. Within the minimum angle of each chamfer shown, the angle between any tangent line of the chamfer and the connector gripping head mouth line does not exceed 60". If the front of the chassis extends to the inner surface of the right side panel (as shown in Figures 1 and 2), the width of the adjacent connector socket cannot exceed the recommended value of 12mm. The socket width can be greater than 12mm elsewhere: but the maximum is 172mm. The dimensions of the connector socket contact pins are indicated in Figure 5.4. The position of each edge is determined by the dimensions (D, d) related to the horizontal reference plane of the socket, and is completely unrelated to the edge positions of all other contact pins in the two rows. In addition, a connector seat with point contacts can be used. In this case, the distance between each point contact pin and the horizontal reference plane of the connector socket is (2.56+2.54K)±0.13mm. 4.1.3 Optional features of the chassis
The chassis height can be calculated according to the U unit The rails are expanded by an integer multiple of the positions, as shown in Figure 6. This allows cold air to enter and flow upward between the rails, while also providing an outlet for the hot air rising from the equipment below. A chassis can have less than 25 stations. The width of the front opening of the chassis for each station is 17.2S3mm, and the formula in Figure 1 is used to determine the position of the rails and connector sockets for each station. The power supply unit can be installed at the rear of the CAMAC chassis. The total depth of the chassis with the power supply installed at the rear is limited by the depth of the rack. Figure 3 shows a recommended maximum depth of 525mm. The highest point of the installed power supply unit must not exceed the maximum height of the chassis data line device to avoid obstructing the ventilation air from entering the chassis. The width of the power supply unit installed at the rear of the chassis is limited to 447mm. 4.2 Plug-in
A plug-in mainly consists of a front panel with fixed screws, an upper panel that slides on the chassis rail convex , a slide frame and an 86-way connector plug. The typical connector head is part of a complete printed circuit board, but it can also be an independent plug-in connector installed on the back of the plug. A plug-in can occupy more than one station, so there can be more than one slide frame and more than one plug. Unless otherwise specified, all plugs must comply with the provisions of Figures 4 and 5 regarding the plug part. The following sections are explanations of these figures. 4.2.1 Dimensions
The horizontal reference plane of the plug-in is the edge of the slide, and the vertical reference plane is the back of the front panel. When the plug-in is fully inserted into the chassis, the upper and lower parts of the back of the front panel should contact the crossbar of the chassis. Therefore, as required in Figure 4, there should be no protrusions on the front mounting surface and the lower 11m function except for the fixing screws. The dimensions of the single-width plug-in and double-width fingers are listed in Figure 4, and the front of the plug is given. General formula for panel width. The fixing screw should have a push and push function to help overcome the resistance when the plug is inserted into and pulled out of the connector socket. GB5691-85
The fixing screw of the single-width plug is located on the center line of the front panel. If a multi-width plug has only one fixing screw and it has a finger-like function, then the screw should be in the appropriate position to provide the most effective help in overcoming the resistance to insertion and withdrawal of one or more chassis data line connectors (that is, for a single connector, it should be located at the same connector station, and when there are one or more connectors, they should be in roughly symmetrical positions
Above the maximum sleeve height of the chassis data line device, the rear end of the plug can have a protruding part extending beyond 290mm. Below this height, in order to provide installation space for the connector socket, only the connector head is allowed to extend beyond 290mm. There should be sufficient ventilation from the bottom to the top of each plug to dissipate the heat generated in the plug. 4.2.2 Chassis Data Line Connector Plug
The dimensions of the chassis data line connector plug are shown in Figures 5.1, 5.2 and 5.3! All 86 contact pins are present and extend to the edge of the plug without chamfering to prevent abrasive damage to the plating of the connector contact pins from the exposed core of the plug substrate. The top and bottom of the connector plug are chamfered: therefore, the upper and lower corners of the connector plug do not need to be chamfered. If there is a chamfer, the maximum allowable value is 1mm×1mm. The contacts on the plug are straight and plated for at least 13m from the edge of the plug end. The dimensions of the connector contact pins are shown in Figure 5.3. The position of each contact pin edge is determined relative to the horizontal plane dimensions (h, H), and is completely independent of the position of all other contact pin edges on both sides of the plug. The lowest contacts on both sides of the plug can be extended to the horizontal plane to reduce the impedance of the 0V line.
4.2.3 Inserting the plug-in into the chassis
In the initial stage of insertion, the plug-in is supported by the lower rail of the chassis. Although the upper slide frame is on the guide rail, there is some clearance in the vertical direction. When the plug-in is fully inserted, the connector plug is positioned by the connector socket and the front panel is tightened by the fixing screws. At this time, the upper and lower slides are in the guide rails and are roughly parallel to the guide rails, with some vertical clearances at the top and bottom. The transition between these two states is detailed in the size matching of the lower guide rail and the slide frame (see Figures 1 and 4), which ensures that the plug-in can move freely along the guide rail and be inserted. The front edge of the connector plug enters the chamfer of the connector socket, and the lower corner of the front of the plug contacts the lower chamfer of the socket. When the slider is further inserted, the connector plug moves up until its lower edge rests on the horizontal reference plane of the connector socket. Before any electrical contact occurs between the connector plug and the finger holder, even a plug with the maximum permissible chamfer of 1 mm x 1 mm should be moved up to the correct position. The maximum auxiliary position without electrical contact (relative to the vertical reference plane of the connector socket) is specified in Figure 5.5. Even a plug with the maximum thickness should be able to do this. Before reaching this position, it should be possible to fully engage the fixing screws in the corresponding screw holes on the lower horizontal surface of the chassis. For this purpose, the ends of the screws are made conical. This also helps to move the front panel to the correct position. Inserting the fixing screws can help the plug to enter the chassis further. The fingers are further inserted, so that the plug and socket feet are meshed, and at this time, there is an insertion resistance between the connector plug and socket. The recommended maximum insertion resistance and withdrawal resistance for each connector plug is 80N. Forces exceeding this specification will cause the plug to be stuck during insertion and withdrawal, and may also cause damage.
Figure 5.5 also includes a line relative to the connector socket and specifies that when this line is exceeded, there will be reliable contact between the corresponding contacts of the plug and the socket, even for plugs of minimum thickness. Finally, when the card is fully inserted into the machine, the leading edge of the connector grip is nominally on the vertical reference plane of the connector socket, and the lower reference plane of the front panel of the card contacts the lower crossbar of the chassis. However, the forces caused by the connector socket and the jackscrews are not in a straight line, which can easily cause the connector plug to leave the horizontal reference plane of the socket. In this case, there may be a gap between the upper reference plane of the front panel and the upper crossbar. Figure 5.5 specifies a minimum distance between the vertical reference plane of the socket and the stopper inside the socket to ensure sufficient clearance beyond the end position of the connector bracket. 4.2.4 Printed wiring board
Figure 8 shows the push-out dimensions of the printed wiring board suitable for typical (but not all) commonly used card frames sized to this standard.
4.2.5 Other connectors
Other components such as buttons or switches can be installed on the front panel or the upper rear end of the plug-in (above the maximum height limit of the chassis data path device.
ww.bzsoso:com Coaxial connectors with the following characteristics should be selected: *a. Small size.
b. Impedance 50.
C. Snap-on type.
4.3 NIM unit adapter
GB 5691-85
All modules that meet the relevant provisions of IEC482 on N-type modules (VIM units) can be inserted into the rails of the CAMAC chassis. In order to provide power to NIM units that are shorter than CAMAC plug-ins, an adapter is required between the chassis data line connector socket and the connector of the NIM unit. The main dimensions of this adapter are given in Figure 7. 4.4 Chassis Data Line
Communication between plug-ins is carried out through the chassis data line. This passive multi-line information channel is installed in the chassis and connects the chassis data line connector sockets on all stations. The chassis data line consists of signal lines and power lines. As shown in Table 2**. When viewed from the front of the chassis, the station on the far right is the control station that plays a special role. The data lines in the chassis data circuit are only connected to ordinary stations outside the control station, not to the control station.
The distribution of the contact pins on the chassis data circuit connector and their connection to the bus, dedicated line and auxiliary contacts, all on ordinary stations, must comply with Table 3***; all on control stations must comply with Table 4****, and the control station must be on the right of all ordinary stations. The composition of the chassis data circuit must comply with the signal standard (see Chapter 7) and the maximum current load regulations for the power line (see Section 8). Most of the signal lines are bus-type lines, which connect all communication stations. Some of the signal lines are connected to the corresponding contacts of the chassis data path connector sockets, and some are also connected to the corresponding contacts on the control station. Other signal lines are dedicated lines, each of which connects a contact on an ordinary station and a corresponding contact on the control station. Each station has some contacts with unspecified uses. Two of these contacts on all ordinary stations are correspondingly bridged together to form two free buses, and the others are used as auxiliary contacts, but the chassis data path wiring is not specified. These auxiliary contacts and other contacts related to dedicated lines and certain buses can be connected to "auxiliary connection points" to which auxiliary lines can be connected. The power line connects the corresponding contacts of the chassis data path connectors on all stations. The power return line (0V) is connected to the two corresponding contacts on all stations.
Apart from this, there are no other regulations for the construction of the chassis data circuit. Printed circuits on channel or non-conductive substrates (with or without ground planes) and solder wires or wire wraps can be used. Special attention should be paid to cross coupling between signal lines and capacitance to ground. It should also be noted that there are higher voltages on the three power lines (+200Vd.c., 117Va.c., live and 117Va.c. neutral). 5 Use of chassis data circuit lines
Each line of the chassis data circuit must be used in accordance with the requirements detailed in the following items and summarized in Table 2. *The recommended connector examples are given in the EU4100e (1972) text, but other connectors may be used when special needs are required. **Instructions:
In 516 installation! ", followed by
* *Adoption description:
in IEC5164 is "Table 2", followed by.
·* *Adoption description:
in IEC5B is "Table 3\".
Subaddress
Strobe 1
Strobe 2
Request attention
Command reception
Public control
Initialization
GB5691—85
A1, 2.4.8
Standard usage of chassis data path
F1, 2-4-8.16
W1~W24
R1～R24
Use in module
Select module (special for automatic control station
Select module + base-local
Specify the attack to be executed in the module
The first stage of the control operation (chassis
The data path signal must not
control The second section of the production (the machine
chassis data line signal can be released
and the software sends you
[module gets the message
indicates that the service is required (to the control
dedicated line)
indicates that the chassis data line operation is in progress
indicates the standard state selected by the command
indicates that the module can execute the command request
for each of the connected lines
character takes effect without the need for commands
the module reaches a certain state
(half S2 and B)
please guide the special time to run special
non-standard connection
free bus
auxiliary missing contact
must follow the smooth power line
- 24 Vd,
Attached power line
-200 Vd. c.
- 12 Vd- *.
117V+.(live line)
117Va:2.(neutral line)
GB 691-85
Continued Table 2
P1, P2
YI, 12
Use in the module
Clear register (with S2 and B1)
Used for non-specified use
Used for non-specified connection, not connected to the machine
Cabinet data route
The chassis is connected with the power source lines that must be followed
and Sheng
Power supply circuit
These lines are prepared for-listing several grams
Supplying low current power for indicators, etc.
As circuits requiring clean ground
Reserved for future allocation
:COM bus
Auxiliary contact
Auxiliary isolation
Auxiliary contact
24 Write bus
Command acceptance
Please note
Select 1
Select 2
W1 = least significant bit
W24 = most significant bit
24 Read bus
R1 least significant bit
R24 = most significant bit
[17Va, c live wire
1 Confidential
+12Vd, c.
LoV (power supply circuit)
GB 569185
Table 3 Allocation of contact pins on the common station
(viewed from the front of the chassis)
— 24
Subaddress
Subaddress
Handheld address
ground
initialization
- + Vd, c.
117Va, e, line
+ 24 Vd, c.
0 (power supply loop)
axis Ding Teng
that touch weak
auxiliary touch
command change
select 1
port pass 2
2 request attention line L1
to the country station, and so on.
+200vd.c.
117Va.s, [main line]
V (power supply line)
GB5691--85
Table 4 Control station king contact pin assignment
(direct reputation from the front of the chassis)
Sub-environment certificate
Sub-address
Sub-address
Sub-address
Initialization
24 station number special line
N1 to station 1. Concentrated standard.
- 6 vd. c.
117Va.c, (line)
Clean ground
+ 6 vd.c.
0V (power supply line)
GB 5691—85
A typical chassis data path operation includes at least two modules, one of which acts as a controller and the other as a controlled module (see Section 3.2).
There are two typical chassis data path operations: command operation and non-addressing operation. During command operation, the controller generates a command, including specifying one or more modules on the station number line. The address line specifies the area to be called by the module, and the power line specifies the action to be performed.
When performing an addressing operation, there is no command. The controller sends any common control signal on the initialization line or the elimination line. This signal is effective for all modules connected to such lines. In command operation and non-addressing operation, the controller sends a command on the current line. A busy signal indicates that a data path operation is in progress. The busy signal is valid for all devices.
S1 and S2 are two timing signals, which are generated on the lines of each device in sequence during the command operation. In non-addressed operations, only S2 must be followed, but S1 can also be generated. During the data path command operation, there can be read data transmitted from the module to the controller, or write data transmitted from the controller to the module, or neither. www.bzxz.net
In response to a read command, the addressed module establishes a read data signal, and the controller can obtain this signal from the time of S1 strobe. In response to a write command, the addressed module receives the write data from the controller when S1 is strobed. The addressed module indicates this with a signal on the command accept line. It can perform the action requested by the command. It may also transmit other status information on response line 1. The controller accepts "command accepted" and "response" signals at the S1 strobe time. Any module can generate a signal on its request attention line to indicate that it requires attention. The use of each chassis data line is specified in the following clauses. The relationship between the various signals that make up the command is determined in Chapter 6. The signal standard and timing are specified in Chapter 7. The timing of events during command operation is described in Item 7.1.3.1 and shown in Figure 9. The timing of non-local operations is described in Item 7.1.3.2 and shown in Figure 10.
5.1 Commands
The signal composition of a command issued on the following lines is: Station line (identifies one or more modules) a. Address line (identifies a submodule in the module) b. Master line (determines the type of operation) The command signal is maintained throughout the duration of the chassis data line operation. A signal is also present on the busy line to indicate to all units that a data line operation is in progress:
When no command operation is in progress, the plug-in must not be affected by the state of the signals on the address lines and function lines 5.1.1 Station number (N)
Each ordinary station is addressed by a signal on a dedicated station number line (Ni) from a separate control on the control station (see Figure 3 and Table 4). The stations are numbered in decimal numbers, starting with station 1 (addressed by N1) at the left end of the chassis as viewed from the front of the chassis. There is no limit to the number of stations that can be addressed at the same time. 5.1.2-f address (A8, A4, A2A1)
Different submodules of a module are addressed by signals on the four A lines. These numbers are encoded in the module to select one of up to 16 addresses: the 16 addresses are numbered A(0) to A(15). The addresses can be used to select various registers in the module, or to control characteristics of response signals (Q), or to operate peripheral functions of the module such as clocking and deceleration. The method of module addressing is described in detail in Chapter 6, which is related to the function code. To use a module, a code must be set in the module. Decoding means using the four data path address signals in the decoding process. The address codes are labeled A(0), A(1), A(2), A(3), etc. to distinguish them from each other. For example, the address numbers A1-1, A2-1, A4-2, A5-3 are unique address codes (A3) GB. 5691-85
5.1.3 Function (F16F 8F 4F 2F 1) The functions to be performed on the selected module call subaddresses are specified by the signals on the five F lines. These signals are decoded in the module and used to select one of up to 32 functions. They are numbered decimal numbers F(0) to F(31). The definitions of the 32 functions are summarized in Section 5.5 and described in conjunction with the command structure in Chapter 6. Function codes are grouped into groups, including read operations, write operations, and operations without data transfer. The standard function codes have defined actions in the module and controller, and the standard function codes are reserved for future use. The use of non-standard function codes is not specified in detail. Each auxiliary code used in a module must be fully decoded in the module. Full decoding means that all five chassis data line function signals are used in the decoding process:
Function codes are labeled F(0), F(1), F(2), F(3), etc., so that they can be used as write F1, F2, F3, etc. 2, etc. Each function line is different. For example, function signals F1=0, F2=0, F4=0, FB=1, F161 represent function code F (25). 5.2 Select signals (S1 and S2)
During each command operation, the controller must generate two select signals. Before the S1 time, the plug-in must not perform irreversible actions based on the command or data signal. Actions related to receiving data and status information from the R, W, Q and X lines must be started at the S1 time. Other actions should be timed by S1, but must not change the state of the signals on the R and W lines.
Any action that can change the read or write signal of the chassis data path must be started by the second select signal S2. For example, if you need to clear a register (whose output is connected to the chassis data path), you must use S2. The select signal S2 must be generated during each addressing operation to indicate that the module accepts common control signals at this time. The strobe signal S1 may also be generated, but this is not mandatory and the module cannot rely on its function. 5.3 Data
All information carried by the read and write lines is called data. It can be information related to the status or control characteristics of the module, so the information sent to or from the control registers in the module is also considered data. Up to 24 bits can be transferred between the controller and the selected module. There are separate lines for reading and writing directions. If the individual bits of the data word have different numerical meanings, the R1 line should be used for bits with a higher order of magnitude than the R1-1 line, and the W1 line should be used for bits with a higher order of magnitude than the W1-1 line. It is recommended that the controller has a 24-bit capacity. In special purpose devices, it is allowed that the controller has a length of less than 24 bits and the module has an equal or smaller length. "
When no command is in progress, the module must not be affected by the status of the line and the signal on the line. Table 5 Function code
Read the first group of purple registers
Read the second group of registers
Read and clear the first group of registers
Read the complement of the first group of registers
* In detail,
In IEC516\Table 1\, the same as below
Use of R and W lines
Function using R line
Function signal
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