Contrologix low battery detection

[SF2004]

How do I detect low battery for the contrologix platform. I read about retrieving an error code from the minor alarms using the GSV instruction but what if there are muliple minor alarms? Would this error code change in value all the time?
Thanks in advance for the help.

 

[rdrast]

Use GSV, Class FAULTLOG, Atribute MinorFaultBits, and store in a DINT.

Bit 10 is the battery status, so you can just examine CPU_MinorFaultBits.10 to check battery status (well, if you named your DINT CPU_MinorFaultBits, that is).

For the record, the battery that comes with the controller is essentially useless. Do youself (and your customer) a favor, and get the 1756-BATM module instead.