Siemens SIMATIC S7-400 Reference Manual page 419

Automation system module data

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Bytes 9 to 24 of the SM 422; DO 16 x AC 20-120 V/2 A

Data record 1 contains the channel-specific diagnostic data, starting at bytes 9 to 24. The figure

below shows the assignment of the diagnostic byte for a channel of the module.

Bytes 9 - 24

S7-400 Automation System Module Data

Reference Manual, Ausgabe 11/2016, A5E00850736-08

Channel error 15

Channel error 14

Channel error 9

Channel error 8

Diagnostic byte for a channel of the SM 422; DO 16 x AC 20-120 V/2 A

Configuring/parameter assignment error

B.4 Diagnostic data of the digital output modules as of byte 2

Diagnostic data of signal modules

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