DATA COMMUNICATION SYSTEM OF PLC SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve a problem wherein when a plurality of management CPUs are mounted on a PLC (programmable logic controller) system, data exchange between CPUs, sharing of PLC common system definitions between all modules etc. cannot be performed.;SOLUTION: The management CPU transmits transmission data to a communication module after developing it in a virtual global memory in an own resource. A communication module collects data from a plurality of management CPUs into one and transmits it to a communication module of a programmable controller of a counterpart after developing received data in its own virtual global memory. A first management CPU transmits to other management CPU and the communication module by using broadcast function of a bus after developing the PLC common system definition from a loader in a virtual global memory of its own resource.;COPYRIGHT: (C)2009,JPO&INPIT