B-10 – Siemens Simatic S7-400 User Manual
Page 584
Diagnostic Data of the Signal Modules
B-10
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Bytes 2 and 3 of the SM 422; DO 32
24 VDC/0.5 A
Byte 2
7 6
0
Operating status 0: RUN
1: STOP
Module-internal supply voltage failure
5 4 3 2 1
0
Byte 3
7 6
0
EPROM error
5 4 3 2 1
0
0
0 0
0
0
0 0 0
0 0
0
Figure B-11
Bytes 2 and 3 of the Diagnostic Data of the SM 422; DO 32 x 24 VDC/0.5 A
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