| 摘要 |
PURPOSE:To check the function of an entire system by reading simulated data stored in a memory in the system in case of checking to execute a prescribed simulated operation thereby. CONSTITUTION:A microprocessor 1 starts the check processing by using a timer of a prescrfibed period and outputs a command of start of check to a check section 11. A contact 9 disconnects a device 14 to be controlled by the operation of a relay 12 and connects it to a digital input 5 to form a feedback circuit. The check section 11 inputs the state of contacts 18, 21 to the digital input 5 via lines 19, 22 and contacts 13c, 13d according to the checking simulated data of a memory 6 and inputs the check simulated data to an interface 2a via a line 23 and a contact 13b. The processor 1 reads data via an A/D converter 3 and the digital input 5, executes the simulated operation, outputs the result to a digital output 7 to drive the relay 8 and turn on/off the contact 9. The check section 11 reads the state of the contact 9 to discriminate the normal operation of the system. |
