504bloke
Lifetime Supporting Member
if you need wire break of AI-channel, I would go with comparing raw data of channel.
0-27648 is normal range for 4-20.
It is stated on AI-manual which numbers are for mA and Volts for outside normal range.
If would check if channel goes below 3ma or above 20,5ma.
OB-blocks are old way for TIA. Not sure when system blocks for checking errors are added. Pretty sure that they didn't exist first on TIA.
Yes thats what I have done before - however as there is diagnostics I assumed with the code it would be easy to just get at it