Siemens Simatic S7-400 - Manual (Page 586)

Diagnostic Data of the Signal Modules
B-12
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Bytes 11 to 42 of the SM 422; DO 32 24 VDC/0.5 A
Data record 1 with bytes 11 to 42 contains the channel-specific diagnostic data.
The figure below shows the assignment of the diagnostic byte for a channel of the
module.
7 6 0
Short-circuit to L+
Short-circuit to M
Wire break
External auxiliary supply missing
5 4 3 2 1
0
Configuring/parameter assignment error
0 0
Figure B-13 Diagnostic Byte for a Channel of the SM 422; DO 32 x 24 VDC/0.5 A
Bytes 2 and 3 of the SM 422; DO 16 20-120 VAC/2 A
Byte 2
7 6 0
Operating status 0: RUN
1: STOP
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
0
Figure B-14 Bytes 2 and 3 of the Diagnostic Data of the SM 422; DO 16 x 20-120 VAC/2 A