Relay check system for pmc

Abstract

Abstract PURPOSE:To easily and surely detect a contact causing a change by executing exclusive OR processing of the stored contents of logical states between a relay coil and contact respectively obtained before and after the change and specifying and displaying the contact. CONSTITUTION:A logical state obtained before a change is stored in an N-bit memory 1 storing the state of a coil in the N-th bit and storing the states of contacts in the 1st (N-1)th bits and the logical state obtained after the change is stored in a memory 2 similarly to the memory 1. When the exclusive OR processing of the contents of respective bits in the memories 1, 2 is executed and the processed result is stored in a memory 3 having the same constitution as the memories 1, 2, a contact corresponding to a obit set up to '1' can be easily and surely detected and displayed as a contact causing the change.

Inventors

• 👤 Sachihiro Nakajima
• 👤 Yoichiro Nishi

Bibliographic Details