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B-12 – Siemens Simatic S7-400 User Manual

Page 586

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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

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