dchartier

...

The followinhg FAQ shows you how to validate that the battery cartridge is still functionnal on your S7-200: Since its lifetime is evaluated at about 10 years, it looks like it would be good for you to evaluate it.

Test of the battery module S7-200:

https://support.industry.siemens.com/cs/ww/en/view/17490344

Notice that for the test it is required for you to unplug the battery module from the CP in order to take the validation measurements  (measuring a minimum of 2.2 V through a 100 kOhm resistance between pins 2 and 6 of the module). This suggests that replacing it with a new one would come down to removing the spent module while the CPU remains powered (so that you do not lose data) and plugging in a new one, once it has been delivered of course.

Hope this helps,

Daniel Chartier

mvidovic

Thank you for your reply, but I was wondering if the memory module would lose power when disconnecting the battery and would that affect the parameters values to go back to inital settings.

Will the main power source still power the retentive memory module while the battery is out, do I need to put PLC to stop mode or something else?

 If you power off the PLC and remove the battery unit, you'll loose the program. You don't need to stop the PLC either.