The overall components of the PLC adopt a modular structure. Through simple combination, users
can change functions of the entire system while the whole control of system functions can also become
easier. Therefore, PLC is suitable for the control of any system.
5.4 Complete module for input and output functions
DC/AC switches, digital value, analog quantity, voltage and current in different fields as well as
other types of on-site signals can be directly connected to the relevant devices i
Study and Application of Advanced PLC Control Strategy-5339字.pdf