The AC500 battery buffers the following data in case of "control voltage off":
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Retentive variables in SRAM (VAR_RETAIN..END_VAR) ⮫ “Handling of remanent variables”
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Date and time of the real-time clock
Further information:
To prevent data loss when using the AC500 battery, the battery status should be periodically monitored by the user program.
Battery status
The battery status can be monitored either with the help of a user program on the PLC or in Automation Builder.
In the PLC shell of Automation Builder the command "BATT" can be used.⮫ “PLC shell commands”. The following is output:
|
0 |
Battery empty |
|
20 |
Remaining battery charge below 20 % |
|
100 |
Battery charge OK |
In the user program, the battery status can be checked with the function BATT which is available in the folder "Battery" of the system library ABB_ExtUtils_AC500.lib (“Library Manager ABB-AC500 Use Cases”). The following is output:
|
0 |
Battery empty |
|
20 |
Remaining battery charge below 20 %, battery must be replaced |
|
100 |
Battery charge OK |
On the device, the battery status can be checked with the function keys of a processor module. ⮫ “Display, LEDs and function keys on the front panel”