SU533927A2 - Control device - Google Patents

Description

register 6, triggers 7, 8, elements AND 9-I, node indication 12.

The device works as follows.

At the initial moment, the shift register 6 is in the zero state, the first trigger 7 is in the zero state, the second trigger 8 is in the single state.

The call signal of the next command is generated, for example, by a micro-command node in the last clock of each command.

The incoming signal writes "1 to the first bit of the shift register 6, and through the first element And 9 interrogates the coordinate registers 1, 2 and switch 5, calling the next command with the execution time, for example, the IV cycle. Promotion "1 in shift register 6 is performed with clock pulses. The signal from the first output of the shift register 6 sets to "1 the first trigger 7 and at the input of the first element I 9 sets a signal prohibiting the passage of the call signal of the next command to the coordinate registers 1, 2 and switch 5. The prohibition is removed by the signal from the second output of the shift register 6 which, through the third element And 11, sets the first trigger 7 in “O.

Then the signal of the next command is received.

Suppose that two commands were simultaneously launched with the execution time of the V and VI cycles. At the end of the first command, the next command will be called, after the second command ends, the next command will not be sent to the coordinate registers 1, 2 and switch 5, because there is no permission at the input of the first element AND 9. in “О”, which leads to the removal of the resolution from the input of the third element I 11 with a simultaneous indication of the nature of the fault.

The lack of resolution at the input of the third element And 11 does not allow the signal from the second output of the shift register 6 to be set to "O the first trigger 7 and the call signal

The next command does not arrive at the coordinate registers 1, 2 and switch 5. Thus, unauthorized execution of the program is terminated.

In order to allow the incoming call signal of the next command to coordinate registers 1, 2 and switch 5, a trigger signal from the outside is necessary.

Thus, the invention, based on the analysis of the time distribution of signals in the control device, allows monitoring at a minor cost of equipment (7-8 cells when implementing on a ferrite-transistor system of elements, or 5-6 housings of the 155 series of an IC element system) , to prevent undesirable consequences of unauthorized program execution, to reduce the time of troubleshooting, which ultimately leads to a significant increase in the reliability of the device.

Claims (1)

Invention Formula Control device auth. St. No. 213421, characterized in that, in order to increase the reliability of its operation, it contains a shift register, two flip-flops, three AND elements and a display node, with the input of the shift register connected to the first input of the device and to the first inputs of the first and second elements AND, the first and the second outputs of the shift register are connected respectively to the single input of the first trigger and to the first input of the third element I, the second input and output of which are connected respectively to the single output of the second trigger and to the zero input of the first trigger a, the zero output of which is connected through the first element I with the control inputs of the coordinate registers and the switch, the unit output of the first trigger through the second element I connected to the zero input of the second trigger, zero output and the single input of which are connected respectively to the input of the display unit and the second input devices.