Siemens SIMATIC S7-400H - Table 5- 2 Possible States of the BUS1 F, BUS2 F and BUS5 F Leds

Assembly of a CPU 41x–H
5.3 Status and error displays
S7-400H
System Manual, 03/2012, A5E00267695-11
57
BUSF1 BUSF2 and BUS5F LEDs
The BUS1F, BUS2F and BUS5F LEDs indicate errors associated with the MPI/DP,
PROFIBUS DP and PROFINET interfaces.
Table 5- 2 Possible states of the BUS1F, BUS2F and BUS5F LEDs
LED
BUS1F BUS2F BUS5F
Meaning
Lit Irrelevant Irrelevant An error was detected at the MPI/DP interface.
Irrelevant Lit Irrelevant An error was detected at the PROFIBUS DP interface.
Irrelevant Irrelevant Lit An error was detected at the PROFINET IO interface.
A PROFINET IO system is configured but not connected.
Irrelevant Irrelevant Flashes One or several devices on the PROFINET IO interface are not
responding.
CPU is DP
master:
One or several slaves at the PROFIBUS DP interface 1
are not responding.
Flashes Irrelevant Irrelevant
CPU is DP
slave:
CPU is not addressed by the DP master.
CPU is DP
master:
One or several slaves at the PROFIBUS DP interface 2
are not responding.
Irrelevant Flashes Irrelevant
CPU is DP
slave:
CPU is not addressed by the DP master.
IFM1F and IFM2F LEDs
The IFM1F and IFM2F LEDs indicate errors on the first or second synchronization module.
LED Meaning
IFM1F IFM2F
Lit Irrelevant An error was detected on synchronization module 1.
Irrelevant Lit An error was detected on synchronization module 2