Example of a pressure control circuit program for Siemens 300 PLC
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This post was last edited by single_air on 2016-8-26 at 22:30. Does anyone have examples of programs for pressure control circuits using Siemens 300 PLCs, including options for manual or automatic mode? Thanks. I’m not sure if the programming is the same as that used for 400 PLCs Please advise; it would be best to provide a practical example to show which type can use PID parameters, along with four alarms: HH, HI, LO, LL
1. Use the PID operation system block in the STEP7 programming software; for continuous signals, it’s SFB43. Determine whether your control output is analog or digital – of course, each control loop requires a corresponding background data block. 2. The S7-300 and 400 series use the same programming software, and both support the PID operation system block SFB. There are numerous other performance differences between the two; if high requirements exist for a control loop and you don’t want to use the soft PID function, you can opt for specialized PID control modules such as SM355. 3. As for upper and lower limit alarm functions, it simply involves comparing analog values – you can set as many levels as you wish :)
I plan to use FC105, FB41, and FC106 for this