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hoshen19

s7 200 temperature control

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Dear All! I have a s7-200 cpu 226 with temperature control of a heater. today the heater operate as a standard heating function ehich is the output of the pid is on until SP is reached. I need that the heater will reach the SP only after a certain time. A function has been made with timer for changing the SP step by step until SP reached after a time. However i'm facing the next problem: 1. the pid Q ( digital ) operate when ACT is 10 higher then SP ,also when ACT reached SP the Q continue to stay ON. Please if someone can assist me with this function it will be very helpfull. eli

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