Knowledge Base
Showing results for 
Search instead for 
Did you mean: 

Why is the i2/ b3887 RAM memory not saved on power failure?


i2887/ b3887 Cool starts on Power failure


i2887, b3887

i2887-L-230, b3887-L-230

i2887-L-115, b3887-L-115


The i2887 and b3887 do not have a RAM battery backup.


The i2/b3887 is one of the range of low cost i2/b3 controllers that does not have a RAM backup battery.

It has no concept of a Warm start that would save working values in the RAM. It does however have Flash Memory that allows the controller to save all of its points and programs. After a power outage these points / programs will be copied into RAM and start running from their first line (if they are Autostart) in what is called a Cool Start. Its ACCRestartMode mode will be ACCCoolStartOnly.


Other i2/b3 controllers that do have a RAM backup battery will allow the ACCRestartMode to be changed as required.

Tags (1)
Version history
Revision #:
1 of 1
Last update:
2 weeks ago
Updated by: