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SIMATIC ET 200SP is a scalable and highly flexible distributed I/O system for connecting process signals to a higher-level controller via a fieldbus.The SIMATIC ET 200SP distributed I/O system is installed on a mounting rail. It consists of:● CPU/interf

摘自Programming the PLC1.1 Operating system and user programThe following figure shows the interaction of the operating system and the user program:Operating system (OS)The tasks of the operating system, for example, include the following:● Proces

Principles of block callsFor your blocks to be executed in the user program, they need to be called from another block.When one block calls another block, the instructions of the called block are executed. Only when execution of the called block has bee