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
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
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
Download PLC-Program Siemens TIA
here: 2 Point Controller TIA