I am familiar with Step 7 and troubleshooting of PLC logic, but I have never designed a PID Loop. I am wanting to use Siemens Standard Function Block FB41 (Cont_C) and I have no idea how to do so.
Specific: I want to control an output to a fisher control valve (4-20mA) for temperature regulation. The twist is I need to control the process to 100 degrees F until I see another digital input (flow) and then ramp up to 140 degrees F. Feedback by thermocouple (4-20mA). No valve position feedback.
My question is, does any one have a good explanation of FB41 terms and inputs… notice I said good, as in a newbie to PIDs could understand? Or does anyone have any suggestions of the best way to go about tackling this logic.
If more info is needed I will be glad to post.
Thanks in advance
Specific: I want to control an output to a fisher control valve (4-20mA) for temperature regulation. The twist is I need to control the process to 100 degrees F until I see another digital input (flow) and then ramp up to 140 degrees F. Feedback by thermocouple (4-20mA). No valve position feedback.
My question is, does any one have a good explanation of FB41 terms and inputs… notice I said good, as in a newbie to PIDs could understand? Or does anyone have any suggestions of the best way to go about tackling this logic.
If more info is needed I will be glad to post.
Thanks in advance