Siemens SIMATIC NET S7-400 Manual page 28

LEDs
Unlabeled LEDs have no significance (only relevant for diagnostics).
INTF
(red)
28
EXTF BUSF
(red) (red) BUS1F /
BUS2F (red)
-
RUN STOP
(green) (yellow)
*)
- -
CP operating mode
Starting up (STOP->RUN)
Running (RUN)
Stopping (RUN->STOP)
Stopped (STOP)
In STOP mode, configuring and per-
forming diagnostics on the CP remain
possible.
STOP with internal error
•
(for example IP double addressing
detected during startup of the CP
in network)
or
following memory reset / reset to
•
factory defaults
The following applies in this status:
The CPU or intelligent modules in
•
the rack remain accessible using
PG functions (over MPI or the ISO
protocol).
SNMP functionality and access
•
using HTTP are not possible.
Error on the RNA interface
•
(BUS2F)
– The transmission mode of the
communications partner is not
permitted (only the "automatic
setting" mode with 100 Mbps
full duplex)
– PRP error
or
double IP address
•
RUN with external error;
•
The CP diagnostics buffer pro-
vides detailed information.
Manual, 03/2019, C79000-G8976-C299-04
CP 443-1 RNA