Channel-Specific Diagnostics Data - Siemens SIMATIC Manual

Diagnostics data of signal modules
B.3 Channel-specific diagnostics data
B.3

Channel-specific diagnostics data

Introduction
The channel-specific diagnostic data follow the channel error vector. The number of bytes
used per channel for channel-specific diagnostics depends on the number of bits entered in
byte 5 "Length of the diagnostic information".
The following figures show the assignment of the diagnostic byte for a channel or a channel
group of the special module. The following generally applies: When an error occurs, the
corresponding bit is set to "1".
A description of possible causes of the fault and corresponding corrective measures can be
found in the section "Diagnostics of the modules".
Digital input channel of the SM 321; DI 16 x 24 V DC; with process and diagnostic interrupt
Figure B-5
Digital output channel of the SM 322; DO DC 8 x 24 V/0.5 A; with diagnostic interrupt
Figure B-6
588
Diagnostic byte for a digital input channel der SM 321; DI 16 x DC 24 V
Diagnostic byte for a digital output channel of the SM 322; DO DC 8 x 24 V/0.5 A
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ