We have a "fail to follow" or "setpoint deviation" alarm that provides a range for the output based on the setpoint. That alarm has a delay, to allow the system to react to the new setpoint. Pretty standard stuff. Most of the time it works as designed.
However, if we get very rapid changes to the setpoint the system never gets within the "OK" window before the next setpoint change (the system behavior is as expected, sometimes the control source sends setpoints faster than our response rates, I can't stop that, don't control the source of the setpoints). Don't want to make the window wider because then the operators will be delayed when it is a real problem.
So, the question, is there any way to reset the active delay timer each time the setpoint changes? That would allow us to keep a relatively short delay, while dealing with the cases where we have rapid changes to the setpoint.
(And yes, do it in the PLC makes sense, but I don't have access).