Communication Between Remote Plcs In A Hybrid Structure

Abstract

Absrrucr: The PLCs are now more flexible and powerhl due to their network operation. The paper deals the communication in a hybrid decentralized PLC system. The system operates as a bi-directional communication system based on a serial port RS-232 each element receiving and sending ASCII telegrams. A program was designed and implemented for testing the Communication in the system. For each PLC the test program was written in his own pro,g"ming language. The system includes also a MMI element, the Operator Station that is shared by the PLCs. The written test program and test program and specific routines can be used when operating in a hybrid PLC system, not having, as usual, a specific communication protocol.