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搜尋常見問題
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

施耐德電機Taiwan

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
 

施耐德電機Taiwan

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