What is the purpose of the external battery of the M221?
1) The help content give us the information the battery of the M221 allow:
-to save the content of the whole %MW area ( %MWi with i>50; note: %MW0-%MW49 are also save without battery)
- to save the RTC clock
2) But in reality the battery is always needed/mandatory because without battery the PLC can’t start in RUN after a PowerOFF, PowerON of the PLC
Within %S75 the PLC program can check when the battery has the be replaced before it become out of order (in average every 4/5 years):
When this bit is Set to 1, it means external battery power is low, so has to be replaced soon
-to save the content of the whole %MW area ( %MWi with i>50; note: %MW0-%MW49 are also save without battery)
- to save the RTC clock
2) But in reality the battery is always needed/mandatory because without battery the PLC can’t start in RUN after a PowerOFF, PowerON of the PLC
Within %S75 the PLC program can check when the battery has the be replaced before it become out of order (in average every 4/5 years):
When this bit is Set to 1, it means external battery power is low, so has to be replaced soon
Released for: Schneider Electric Philippines
Need help?
Product Selector
Quickly and easily find the right products and accessories for your applications.
Get a Quote
Start your sales inquiry online and an expert will connect with you.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Help Center
Find support resources for all your needs, in one place.