Fundamentals of PLC program SIMATIC S7-300

Programmable logic controllers (PLC in brief), are considered today as a principal item of automation. With these controllers, most diverse tasks of automation can be implemented depending on the definition of the problem.These documents give you an overview of the automation system SIMATIC S7-300 and the appropriate programming software STEP 7.

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FUNCTION AND DESIGN OF A PLC
The controller has the task of leading single operations of a machine or a machine plant that depend on
sensor signals after a given function execution.

TYPES OF SIGNALS IN CONTROL SYSTEM TECHNOLOGY
The electrical signals which are applied at the inputs and outputs can be, in principle, divided into two
different groups: