SIMATIC S7-200, CPU 224 Battery Replacement

Hey everyone,

I apologize if this question has been answered previously.

I need to replace the battery in SIMATIC S7-200 (CPU 224, 214-1BD23-0XB0).

What is the correct and safest step-by-step procedure for battery replacement for PLC above? 

Can we replace the battery while PLC and machinery is operating and everything is powered on? 

Is there anything that can go wrong with battery replacements I should be aware of? 

Thanks & Regards,

Enn 

ennatwa

Hey everyone,

I apologize if this question has been answered previously.

I need to replace the battery in SIMATIC S7-200 (CPU 224, 214-1BD23-0XB0).

What is the correct and safest step-by-step procedure for battery replacement for PLC above? 

Can we replace the battery while PLC and machinery is operating and everything is powered on? 

Is there anything that can go wrong with battery replacements I should be aware of? 

Thanks & Regards,

Enn 

 Hello Enn,

the S7 200 CPUs do not have batteries inside but a big capacitor. I guess you have this optional module?

6ES72918BA200XA0 - Product Details - Industry Mall - Siemens USA

Hi Ste39,

Yeah looks like I have extra module for battery installed, have a look at the photo attached.

Do you know what's the correct procedure to replace the battery?

Battery hasn't been changed for almost 10y I was told. PLC is driving a metal sheet bending machine, owner is worried about loosing the programming inside the PLC in case of long power failure. Company who built the machine has been closed for years, so no help from them. 

Ideally I'd like to replace the battery and then backup the PLC program, but I don't know how to do that. I work in IT and unfortunately have no experience with PLC's. 

Cheers,

Enn

Hello ennatwa;

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