Well, here's one I haven't run into before: I've been tasked to connect a Fast Measurement input to a signal that behaves in a Normally Closed fashion -- that is, the event I'm supposed to capture is a negative transition of the $MEAS_PULSE input. I've never actually seen a Fast input used this way before.
There's a footnote buried in one of the manuals that suggests that the Fast inputs only work on a positive transition, but it's not definite. So, has anyone ever used a Fast Measurement input with a negative-going signal? I'm confident I could set up an interrupt with WHEN $MEAS_PULSE[1] == FALSE, but my concern is whether the input will still act in the high-speed fashion for a negative-transition signal, as opposed to the positive-transition, which I know works.
The relevant quote from the KSS 8.3 manual:
Quote
Fast measurement is activated with $MEAS_PULSE by means of an interrupt.
When the interrupt is activated, $MEAS_PULSE must have the value “false”,
otherwise an acknowledgement message is generated and the program is
stopped.