I'm trying to use a digital event to turn off digital points (TPO) running as the outputs for some PID loops if an analog input value gets too high. I have this currently set up with a digital point state reaction and my points in the off mask. Because the TPO function is stopped once you send an on or off state to the point, this requires me to reset the TPO function once the input value normalizes. This all works fine, but I would like a way to monitor the state of this "emergency off" function from my HMI hopefully with just a boolean value.
Is there maybe a way to do this using digital latches instead? I think this should have the same desired result - I would just need to change my alarm reaction event to set the off-latch and change my normalization event to clear the latch (and maybe still reset the TPO function?). I could then just add the OPC item for the off-latch state to my HMI to monitor it looks like.
Is there a special memory map address I can use to set a digital off-latch using an event message? I haven't seen a way to do this in the default list of commands for an expanded digital event.
This is all on an EB2 with 9.3b firmware. If this all looks eerily familiar, it's the same project Tricia was working on with some related questions from a couple months ago.