I do get the frequency to start the pump and give me flow, however it doesn't seem to be responding to the error or trying to close the gap between the flow set point and measured flow. I've then taken the 0-16383 control variable N7:85 and scaled that back to 0-100 to send to the pump. What I have done is taken the 0-1500 milliliter flowrate and scaled it to 0-16383 to use at N17:14 for the process variable of the PID. The idea is to set the flowrate and have the pump dial in the frequency to maintain the flow set point. I've got a pump that puts out a 0-100% output signal to set flow that is measured on a flowmeter from 0 to 1500 milliliters. I have programmed the control incorporating all that I've gathered through all these great posts and replies, however I am not getting the PID to fully control my process and wanted to ask what I am missing. I'm new to PLC and I've been reading through many of the posts concerning PID process control in RSLogix 500.
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