Installation of a CPU 41x-H
4-9
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
LEDs INTF, EXTF and FRCE
The three LEDs, INTF, EXTF and FRCE, provide information about the errors and
special events during running of the user program.
LED
Meaning
INTF EXTF FRCE
H x x An internal error has been detected (programming or parameter
assignment error).
x H x An external error has been detected (in other words, the cause of
the error cannot be traced back to the CPU module).
x x H A force request is active.
H = LED lights up; x = LED status is irrelevant
LEDs BUSF1 and BUSF2
The LEDs BUSF1 and BUSF2 indicate errors in connection with the MPI/DP
interface and the PROFIBUS DP interface.
LED
Meaning
BUS1F BUS2F
H x An error has been detected at the MPI/DP interface.
x H An error has been detected at the PROFIBUS DP interface.
B x DP master: One or more slaves at PROFIBUS DP interface 1
are not replying.
DP slave: not addressed by the DP master
x B DP master: One or more slaves at PROFIBUS DP interface 2
are not replying.
DP slave: not addressed by the DP master
H = LED lights up; B = LED flashes; x = LED status is irrelevant
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