Siemens Simatic S7-400

3.5 Fault/Error messages via LEDs
Introduction
The power supply modules of the S7-400 indicate module faults and backup battery faults via
LEDs on the front plate.
Overview of the error messages of the power supply modules
Table 3-6 Error messages of the power supply modules
Type of fault/error LED
Module error INTF
5 VDC
24 VDC
Backup battery fault Power supplies with 1 backup battery:
BAF
BATTF
Power supplies with 2 backup battery:
BAF
BATT1F
BATT2F
Power supply modules
3.5 Fault/Error messages via LEDs
S7-400 Automation System Module Data
48 Reference Manual, Ausgabe 11/2016, A5E00850736-08