Siemens V1.0 - Manual (Page 24)

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5.7 Reading Diagnostics
A diagnostic alarm is sent from the IO device to the controller only when the error occurs. Once
the controller acknowledges the alarm, it is not sent again. The diagnostic information is stored
in the IO device and can still be read until the error goes away. To read the diagnostic errors
stored in the IO devices, first select a Configuration tree item. The diagnostics for all of the
devices under the tree item selected will be read. Then select the “Read Diagnostics” button.
Then Call Up Read
Diagnostics Dialog
First Select
Config Item