Proportional Controller with Siemens S7-1200 (SCL)

Welcome to another Siemens S7-1200 and Factory I/O tutorial.

In this video we take a look at the proportional part of PID control and how to implement it using Siemens S7-1200 SCL code to control the water level in a tank.

I would recommend viewing the Siemens S7-1200 Water Tank Level Control Parts 1, 2 and 6 before watching this video.

Siemens S7-1200 Water Tank Level Control Parts 1
   • Siemens S7-1200 Water Tank Level Cont...  

Siemens S7-1200 Water Tank Level Control Parts 2
   • Siemens S7-1200 Water Tank Level Cont...  

Siemens S7-1200 Water Tank Level Control Parts 6
   • PID Control with Siemens S7-1200 (SCL)  

I would also recommend making this modification to the Fill Valve output as it appears I forgot to clamp below zero in addition to above 10. Hope this makes sense. Please note I was unable to use actual symbols for 'greater than' or 'less than' as they are not allowed in the description.

IF "Fill Valve Temp" is greater than 10 THEN
"Fill valve" := 10;
ELSIF "Fill Valve Temp" is less than 0 THEN
"Fill valve" := 0;
ELSIF "Fill Valve Temp" is less than or equal to 10 AND "Fill Valve Temp" is greater than or equal to 0 THEN
"Fill valve" := "Fill Valve Temp";
END_IF;

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