Leds Ifm1F And Ifm2F; Led Redf; Diagnostics Buffer - Siemens SIMATIC S7-400H Manual

Installation of a CPU 41x-H

LEDs IFM1F and IFM2F

The LEDs IFM1F and IFM2F indicate errors that occur in the first and second
module interfaces.
LED
IFM1F
H
x
H = LED lights up; x = LED status is irrelevant

LED REDF

The LED REDF indicates specific system states and redundancy errors.
REDF LED
Flashes at 0.5
Hz
Flashes at 2 Hz
Off
Lights

Diagnostics Buffer

You can read out the exact cause of an error in STEP 7 (PLC –> Module
Information) from the diagnostics buffer.
4-10
IFM2F
x An error has been detected at module interface 1.
H An error has been detected at module interface 2.
System Status
Linking
Update
Redundant (CPUs are
redundant)
Redundant (CPUs are
redundant)
All the system states apart
from redundant, linking,
updating
Meaning
Boundary Conditions
–
–
No redundancy error
There is an I/O redundancy error:
•
Failure of a DP master or partial or
complete failure of a DP master
system
•
Loss of redundancy on the
DP slave
–
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07