Siemens Simatic S7-400 - Manual (Page 89)

Power Supply Modules
3-9
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Meaning of the LEDs
The meaning of the LEDs on the power supply modules is described in the tables
below. Section 3.5 contains a list of the faults indicated by these LEDs and notes
on how to acknowledge the faults.
INTF, 5 VDC, 24 VDC
Table 3-3 INTF, DC 5V, DC 24 V LEDs
LED Color Meaning
INTF red Lights up in the event of an internal fault
5 VDC green Lights up as long as the 5 V voltage is within the tolerance limits
24 VDC green Lights up as long as the 24 V voltage is within the tolerance
limits
BAF, BATTF
Power supply modules with a backup battery have the following indicators:
Table 3-4 BAF, BATTF LEDs
LED Color Meaning
BAF Red Lights up if the battery voltage on the backplane bus is too low
and the BATT INDIC switch is at the BATT position
BATTF Yellow Lights up if the battery is empty, if the polarity is reversed, or if
the battery is missing, and the BATT INDIC switch is at the BATT
position
BAF, BATT1F, BATT2F
Power supply modules with two backup batteries have the following indicators:
Table 3-5 BAF, BATT1F, BATT2F LEDs
LED Color Meaning
BAF Red Lights up if the battery voltage on the backplane bus is too low
and the BATT INDIC switch is at the 1 BATT or 2 BATT position
BATTF Yellow Lights up if battery 1 is empty or if the polarity is reversed or if
the battery is missing, and the BATT INDIC switch is at the
1 BATT or 2 BATT position
BATTF Yellow Lights up if battery 2 is empty or if the polarity is reversed, or if
the battery is missing, and the BATT INDIC switch is at the
2 BATT position