How to exchange information between PLCs connected by different types of networks

摘要

The present invention relates to a method of exchanging information between PLCs connected by different types of networks, and in the related art, when a PLC # 4 needs to exchange information with a PLC # 7 or a PSI information from a PC (PC) 10. If necessary, it was necessary to connect another network line directly or to at least P2C. However, if the network configuration is over a wide area, such a connection is difficult, and PLC programmers have a problem that can be programmed only when they fully understand the network configuration and the address of each module. Accordingly, the present invention generates a frame and response frame having a service type and a departure, a destination network type and addresses thereof in address translation and data transmission between a computer and a PLC or a PLC and a PLC in a multi-level network, and through the communication module By exchanging information, it is possible to reduce the price by exchanging information using only a communication module even in a wide network configuration.