How to program an ON OFF Controller

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Work order: Programming of a software Two-Point Controller with PLC

First you make an overview of the necessary components and how they may be connected to the PLC. In the following a Siemens PLC, more precisely CPU314 is used. The addresses of the inputs and outputs can also be modified via the HW configuration.

Structure - Two-Point-Control with PLC

Structure - Two-Point-Control with PLC

If all the necessary components are available, you can begin to plan the program. In order to get at an algorithm for the program at first, you should know how determine the Turn-on and Turn-off points.

Two-Point Controller - Switch-On and Switch-Off point

Two-Point Controller - Switch-On and Switch-Off point

The flowchart and the structogram (also referred to as the Nassi-Schneider diagram) are both used to describe the program sequence:

Programming a Two-Point Controller

Programming a Two-Point Controller

Download PLC-Program Siemens TIA

here:    2 Point Controller TIA