I have a question in regards to doing PID temperature control loops in a CompactLogix L23E PLC vs. using a dedicated loop module to do the temp control. In the past we have always done our temperature control using dedicated loop modules. We communicate to the module from our PLC using Ethernet IP or DeviceNet. The load we are controlling the temperature on is typically a 12” x 18” x 1 ½” resistive heater (a fairly slow loop). The modules have the typical built in Auto tune function, which sets the PID values, thus removing the manual tuning process and room for error. In a nutshell we’ve had good success doing the PID outside of the PLC. I’ve been looking at the PIDE function in the RSLogix 5000 software and I’m not sure if this might be the way to go. Any input on Pro’s and Con’s of PLC vs. Loop Module would be much appreciated.
Thanks
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