This what is pid video is the 3rd in the closed loop system video series this one introduces the plc pid using a rslogix 500 tutorial and pressure control system example of applying the pac . An example of temperature pid control is shown here the pid closed loop control holds a process variable at a chosen setpoint it ranges from 1 to 255 on the slc 5 00 and 5 01s and 0 32767 for the slc 5 03s and 5 04s a rule of thumb is to set the gain to one half the value needed to cause the system to oscillate when the reset and . Knowledge of pid a good working knowledge of the logix 500 platform and a good working knowledge of the process and system to which the pid block is to be applied. With that being said the pid controls the flow to a different sp than that entered for example when a sp of 125 ml min is entered it seems to output a frequency corresponding to about 65 ml min flow this can be moved closer to the actual sp by increasing the gain on the pid but i really think the output to the pump is causing the problem
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