| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an industrial electronic computer in which a time required for restoring operational failure can be sharply shortened. SOLUTION: First, second, and third counters 4A, 4B, and 4C operate count-up synchronously with a clock signal from a clock circuit 2. When software is in a normal state, a count value is reset by a reset signal R-WDT from a reset circuit 3 after each lapse of a fixed time, and when operational failure is generated, the reset signal R-WDT is not outputted from the reset circuit 3. When a set time passes since the reset signal R-WDT is finally outputted, the counter 4A outputs a signal RST1. Then, an interruption controlling circuit 5 operates interruption communication for resorting the operation. When the operation is not restored, the counter 4B outputs a signal RST1, and a system reset circuit 7 performs a reset operation. When the operation is still not restored, the counter 4C outputs a signal RST3, and a process control circuit 9 temporarily turns off a system power source, and then turns it on.</p> |
