Siemens SIMATIC ET 200M Manual page 241

5 On Section 6.4.7
Information on channel-specific diagnosis
Errors which affect all the channels of a module (e.g. supply voltage of the module
failed) are only mapped to Channel 0 in the channel-specific diagnostics.
This reduces the number of channel-specific diagnostics and prevents a
"diagnostic overflow".
6
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Product Information for Distributed I/O Device ET 200M, Manual
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