SU550631A1 - Device for information exchange - Google Patents

Description

connected to the third input of the program block, the second output of which is connected to the first input of the coding block, the third input of which is connected to the second output of the block of registers.

The drawing shows a block diagram of the proposed device, which includes an input / output unit 1, a decoding unit 2, a register unit 3, a communication unit 4, a coding unit 5, a program unit 6, a repetition unit 7, a control unit 8.

The device works as follows.

Depending on the received command word from the computer complex, the following modes of information exchange over the main communication channel are organized: the installation is common; determination of addresses of controlled points that issued a signal to request a communication; determining the addresses of the function blocks that issued the communication request signal; determining the addresses of functional elements included in the functional unit, issuing a communication request signal; well-established communications; transfer of information to the functional receiver unit; receiving information from the source function block; Repeat reception of information from the source function block.

Each mode of operation corresponds to one communication cycle on the main channel in the absence of distortion of the transmitted information. If there is a distortion of information in the communication channel, the cycle is repeated. At the beginning of each communication cycle, the device issues a sync pulse to the trunk channel, and then an operation code, and each operation has its own operation code.

In “Installation, a common unit 6 receives from the computer complex through the first input of the device and block 4 a signal,“ Installation is common and generates an CCW operation code. Upon receipt of the "Setup common" signal, all the device circuits are set to the outgoing state and, after forming the CCW operation code, block 4 sends a pulse to block 8, which generates a control signal outputted through block 1 and the second output of the device to the trunk link . The sync pulse is also perceived by the receiving circuit of block 1 and is fed to block 8, where clock and program pulses are generated along the falling edge of the sync pulse. On the first clock pulse into the trunk channel through block 5, block 1 and the second output, the first digit of the CCW operation code is issued. In block 5, each bit of information transmitted is encoded. By issuing a sync pulse and CCW operation code, at each subsequent clock cycle the device receives response signals about the receipt of CCW operation code from the monitored points connected to the trunk channel, and at the last clock cycle it receives a signal, either absent or missing, that indicates the correctness of information received by the monitored points. These signals through block 1 arrive at block 2, where they are monitored and decoded. From the output of block 2, signals are sent to block 3. In the absence of a response from at least one of the monitored points connected to the trunk channel or when information is distorted in the communication channel, block 2 issues an error signal to the block that organizes the repeated communication cycle together with block b and block 8, starting with the issuance of a sync pulse. At the end of the communication cycle in the absence of an error, or after the termination of the w. Advance of the number of cycles specified by the device in the presence of an error, the unit

8 issues a readiness signal to the computing complex through the first output and block 4, using which the computing complex can output signals to block 4 corresponding to receiving information from the device.

In this case, block 8 issues a signal for the presence of a computer with block 4, whether or not it is present, and if the latter is present from block 3, an error code is issued. If the error is not detected, on the computer complex with

unit 3, the position code of the response signals of the monitored items is issued.

In the mode "Determining the addresses of controlled points that issued the signal of the communication request, the computing complex issues

block 6 command word corresponding to the specified mode, which generates an operation code K01. Further operation of the device is similar to the operation described in the "General installation mode, except that the device receives signals for the presence or absence of communication requests from monitored points during certain cycles. These signals are underused in block 3 and output to the computing complex, where the address is determined.

controlled point, issued a request for communication with the highest priority.

In the mode “Determining the addresses of functional units that issued the communication request signal, the computer complex issues

block 6 is the command word corresponding to the specified mode, and in block 3 is the address of the controlled point issuing the signal of the communication request that has the highest priority. The generated operation code K02 is output to the channel.

communication, as defined in the "General Setup" mode, and on subsequent cycles from block 3, through block 5 and block 1, the address code of the monitored point is output to the communication channel, and then at certain cycles, the response signals of the functional blocks that receive the request signal are received from the channel communications that are connected to the selected controlled item. These signals are recorded in block 3, and upon termination of the communication in the trunk channel, they are received into the computer complex in the same way as described in the Installation Common.

In the mode "Definition of addresses of functional elements that issued the request signal

communication complex issues in

block 6 is the control word, and in block 3, the address of the function block that issued the signal of the communication request that has the highest priority. Further operation of the device is similar to the work in the mode "Determination of addresses of functional blocks with communication requests. Upon termination of the communication in the trunk channel, the computer complex receives the positional code of the addresses of the functional elements that issued the communication request signals.

In the Communication Establishment mode, the device establishes communication with a receiver functional element or source. In this mode, the computer complex issues to the block 6 the command word and to the block 3 the code of the addresses of the controlled item, the functional block, the functional element with which it is necessary to establish communication. Then a sync pulse, an operation code K04 and an address code are generated and sent to the communication channel in the same way as described in the "Determining the addresses of the function blocks that issued the communication request signals. After that, at certain cycles, block 3, through block 2 and block 1, receives a communication request signal (if it is present at least in one of the monitored points), unavailability signals, malfunctions of the functional element with which communication is established, as well as a fault signal.

If one of the signals is present: unavailability, malfunction or failure, an error signal and an error code are output to the computer system. A communication request signal is issued only in the absence of a failed signal. The "Establishment of communication" mode always precedes the "Transfer information to a functional block-receiver or" Receive information from a source function block, since in this mode the functional block (functional element) to which you need to transfer or receive is sent. him information.

In the “Information transfer to a functional block receiver mode, the computing complex issues a control word to block 6, and a block word to the information block 3. After issuing the sync pulse and operation code K05 to the communication channel, unit 3, at certain cycles, issues an information word through unit 5 and unit 1 to the trunk channel. In the absence of information distortions in the communication channel, the control unit on the last clock receives a no-fail signal and the communication in the channel is stopped, and block 8 outputs a ready signal to the computer complex through block 4. When a signal is received, unit 7 organizes the repeated mode “Information transfer to a functional receiver unit, starting with the issuance of a clock pulse.

In the “Receive information from the source function block” mode, the computer complex issues a control word to block 6, which generates the operation code KOB and outputs it to the communication channel, as described in the “General installation. On subsequent cycles, block 3 receives a bit from the trunk channel through block 1 and block 2, an information word, and at the last clock a signal is present or absent.

If there is a distortion of information in the communication channel detected by block 2, block 7 analyzes the presence or absence of a failure signal and, if there is one, it re-organizes the Reception of information from the source function block, and in its absence it organizes the mode Repeating reception of information from the functional block -source.

In the mode “Repeating reception of information from the source function block, block 7 outputs the corresponding signals to block 8 and block 6, which forms the operation code K07. In this case, the issuance of the channel

communication of the sync pulse by the block 8 and the operation code K07 by the block 6, and on subsequent cycles the reception of the information word and the presence or absence of a signal is received. Received information at the end of the communication cycle is issued

from block 3 to the computing complex, it is similar to issuing information described in the “Installation common” mode. The mode "Repeating reception of information from the functional block of the source excludes re-access

controlled item to the functional block instuchniku.

This is necessary when connecting to the controlled items of functional block sources, in which information is read during the readup. The use of the device allows to increase the reliability of the transmitted information.

Claims (2)

1. Author's certificate of the USSR 225562, M. Kl.2 G 06F9 / 18, 25.11.66. 2. Journal of Instruments and Control Systems, No. 10, 1972, p. five.