Installation of a CPU 41x-H
4-10
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
LEDs IFM1F and IFM2F
The LEDs IFM1F and IFM2F indicate errors that occur in the first and second
module interfaces.
LED
Meaning
IFM1F IFM2F
H x An error has been detected at module interface 1.
x H An error has been detected at module interface 2.
H = LED lights up; x = LED status is irrelevant
LED REDF
The LED REDF indicates specific system states and redundancy errors.
REDF LED System Status Boundary Conditions
Flashes at 0.5
Hz
Linking –
Flashes at 2 Hz Update –
Off Redundant (CPUs are
redundant)
No redundancy error
Lights Redundant (CPUs are
redundant)
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
All the system states apart
from redundant, linking,
updating
–
Diagnostics Buffer
You can read out the exact cause of an error in STEP 7 (PLC –> Module
Information) from the diagnostics buffer.
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