Detailed descriptions
16.4 I/O Address Areas
SIMATIC IPC427C
140
Operating Instructions, 04/2009, A5E02414743-01
16.4.5
Output register LED 1 / 2 (read/write, address 404Eh)
Meaning of the bits
Output register LED 1 / 2 (read/write address 404Eh)
Bits
15
14
13 - 8
7
6
5 - 0
1
1
LED L1 / SF dark (default)
1
0
LED L1 / SF lights yellow
0
1
LED L1 / SF lights red (= group fault)
1
1
LED L2 / R/S dark (default)
1
0
LED L2 / R/S lights yellow (= STOP)
0
1
LED L2 / R/S lights green (= RUN)
xxxxxx
xxxxxx
Reserved (read/write)
Note
The L1 and L2 LEDs indicate by flashing alternatively yellow the progress of the BIOS self-
test during the device startup. When the BIOS self-test is completed, the L1 and L2 LEDs go
dark.
