| 摘要 |
PURPOSE:To raise the reliability of an input/output part, by comparing an inputted external reference value with a reference value stored in an internal memory, and deciding an input bus to be abnormal, in case of dissidence as a result. CONSTITUTION:In order to monitor an abnormal state of an input/output bus 1 of a device, a reference value is set to the outside. Also, the reference value is set to a core memory in advance. Subsequently, the external reference value inputted by a sequencer is compared with the internal reference value. As a result, in case of coincidence of both of them, the input part is decided to be normal, and in case of dissidence, the input bus is decided to be abnormal. In this way, the reliability of the input/output part is raised. |
