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I am needing to control a valve to handle a control valve between a upstream pressure transmitter (upstream of control valve) and a downstream pressure transmitter (downstream of the control valve). I need to have the control valve maintain a certain amount of positive differential pressure and at the same time not allow the downstream pressure to go over a maximum pressure, say 300 psi. Any ideas of how to handle this in ladder logic, with of course a PID loop.
Thanks.
Thanks.