Plc Error Reaction - Siemens SIMATIC S7 System Manual

5.7

PLC error reaction

When you select the "Devices" entry of the tree, STEP 7-Micro/WIN SMART displays the
summary error status for the CPU and any expansion modules. To show detailed error
information for each device, select the device name in the tree.
Note the following information:
● The "Last Fatal" field shows the previous fatal error code generated by the CPU. This
value is retained over power cycles. This location is cleared whenever all memory of the
CPU is cleared.
● Selecting the Event log entry in the tree displays the CPU's stored event history, including
events such as power up, power down, errors, and mode transitions. The time of events
is also listed.
● The PLC also provides SM bits for programmed reactions to errors. Refer to the listing of
the SM bits (Page 799).
● The GET_ERROR (Get non-fatal error code) program instruction returns the PLC's
current non-fatal error code and clears the non-fatal error information latched in the PLC.
Refer to the GET_ERROR instruction (Page 356) for details.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Programming concepts
5.7 PLC error reaction
Click the PLC but-
ton from the Infor-
mation section of
the PLC menu
ribbon strip to see
the current error
status.
To identify specific
errors, refer to the
error code lists
(Page 791).
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