S7-400 Backup Battery 1

[flinana]

Hi,

Does anyone know the lifespan of the backup batteries found in the PS for the S7-400?

thanks

 

[ozmosis]

flinana
It depends on the modules used, but the quoted figures are:
300 days for the CPU 412 and CPU 416 and approx. 190 days for the CPU 417.

 

[flinana]

Cheers m8

 

[itsmoked]

That's so you have nine years to figure out a PLC replacement when you find the weird battery is discontinued..

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[dieselvette]

My PLC engineer suggests the best way to back-up info for any length of time is to use a memory card and re-write to it every hour or so. This will keep your info indefinitely. Each time the PLC powers up, give it a one-shot to grab the info from the memory card before starting the rest of the program.

Would this replace your battery, or is there some reason that this wouldn't work in some situations?

Nic Van Engen
Electrical Technician