SIEMENS S7-300/400 module Manual(1)
User Manual
This document introduces the basic structure and working principle of S7-300/400 modular PLC, as well as information about major manufacturers such as Siemens. S7-300/400 consists of rack, CPU module, signal module, function module, interface module, communication processor, power module, and programming device. The document also covers topics such as logical operations, working process, and scanning process of PLC.
