| 摘要 |
<p>PURPOSE:To decrease the delivering frequencies of misinformation to a temporary excess of the program cycle by providing a function to an arithmetic conrol part to monitor the regular excess of cycle of a regular cycle processing function. CONSTITUTION:The instruction of a sequence program stored in a program memory 21 are read successively out of the addresses designated by a program counter 221 and sent ot a CPU224 via an instruction register 222. The CPU224 performs analysis of an interruption input and the selection and execution of the corresponding interruption function when an external interruption input is supplied from an input part 23 or an interface circuit 26. While the CPU224 executes a regular cycle processing function when a regular cycle clock interruption inout is supplied from a clock circuit 226. In this case, a monitor counter 227 is counted up by +1 by the CPU224 for each input of the regular cycle clock interruption. Then the counter 227 is counted down by -1 every time the execution is through with the regular cycle processing function.</p> |
