PLC analog output module with low cost expansion

Programmable controller (hereinafter referred to as PLC) due to the high reliability, simple programming, strong versatility, small size, compact structure, installation, plc analog output module maintenance is convenient wait for a characteristic, and in industrial control has been widely used. General PLC module for the following categories, switch quantity input module, switch module output, analog input module and analog output module.

In the industrial control especially process control in the field of analog acquisition and control needs to be more, more and need of PLC Analog input and output module, and analog input and output module is more expensive and increase the analog input and output module increases the cost and reduce the price of the entire system, limit the application of PLC. This paper presents a method of extended analog input output module,  high-speed counter modules communication based on trying to solve this problem.