Siemens Simatic S7-400 - Manual (Page 93)

Power Supply Modules
3-13
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
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 Fault/Error Messages
Table 3-7 Error messages of the power supply modules
Type of Fault/Error LEDs
Module fault INTF
5 VDC
24 VDC
Backup battery fault Power supplies with 1 backup battery:
BAF
BATTF
Power supplies with 2 backup batteries:
BAF
BATT1F
BATT2F
INTF, 5 VDC, 24 VDC
The following table shows the faults indicated by the INTF, 5 VDC, and 24 VDC
LEDs and lists how to remedy the faults.
The status of the BAF, BATTF, BATT1F, and BATT2F LEDs is not relevant here.
Table 3-8 INTF, DC5V, DC24V LEDs
LED
INTF DC5V DC24V Cause of Fault Remedy
D D D
Standby switch in position Set standby switch to the
I
position
Line voltage missing Check line voltage
Internal fault, power supply module
defective Replace power supply module
Cutoff after overvoltage on 5 V or illegal
external supply Disconnect from mains and reconnect
after approximately 1 minute; if
necessary, remove external supply
Power supply module operated in
wrong slot Install the power supply module in the
correct slot (slot 1)
Short circuit or overload on 5 V Switch off the power supply module,
remove the source of the short circuit;
after approximately 3 seconds, the
power supply module can be switched
on with the standby switch or via the
power system.*
D H D Overvoltage on 24 V Check if the supply is external; if not,
replace power supply module