| 摘要 |
A method and apparatus for monitoring and diagnosing troubles in sequential control operations. Cycle memorizing means respectively memorizes performed sequence cycles, and a timer is energized simultaneously with the start of the sequence cycles and is de-energized at the completion of the completed sequence cycles. The setting time of the timer is slightly longer than the time required to complete the completed sequence cycles and therefore, a diagnosis operation is performed in consideration of the memory in the cycle memory means when the timer times-out. |
