FAULT DIAGNOSTIC SYSTEM FOR PROGRAMMABLE CONTROLLER

摘要

PURPOSE:To easily judge a failed device without preparing a specific program even at the time of using a device relating to respective steps in a program. CONSTITUTION:This fault diagnostic system has a device condition storing part 9 for storing device conditions used for respective steps and transitions of a sequential function chart and a fault monitoring part 7 for detect a fault position based upon the device conditions stored in the storing part 9 when a fault occurs in a controlled target.