1756-L61 B Battery Light indicator different to program

[TrevorD 1]

Hi All

I have an issue with 2 controllogix L61 controllers. 

I needed to change the battery in controller 1.

Controller 2 is a spare.  

Instead of paying for the genuine battery (which i probably should but i'm trying to be cheap) i soldered a 3v battery with tabs on to the old wires.

Battery reads 3.6v at the plug. 

When i plug battery into both plc's the battery light on the PLC is on and will not go off. 

The battery acts as if its flat as it does not hold memory when powered off. 

What i find really unusual is in rslogix5000 the battery indicator reads ok even though the plc bat light is on.

The second i disconnect the battery then it appears in the program as battery disconnect. 

I don't understand how the plc battery light on the plc and the one in rslogix5000 show different and how its the same across the 2 plc's i have.

Trevor 

  

 

 

 

[pturmel 159]

Get the right battery.  Sounds like the substitute is not the correct voltage.  (A tiny difference matters.)