Displaying Diagnostic Events In The Cpu - Siemens SIMATIC S7-1200 System Manual

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Online and diagnostic tools

15.10 Displaying diagnostic events in the CPU

Displaying diagnostic events in the CPU

Use the diagnostics buffer to review the recent activity in the CPU. The diagnostics buffer is

accessible from "Online & Diagnostics" for an online CPU in the Project tree. It contains the

following entries:

● Diagnostic events

● Changes in the CPU operating mode (transitions to STOP or RUN mode)

You can also use the GET_DIAG instruction (Page 480) to collect the diagnostic information.

The first entry contains the latest event.

Each entry in the diagnostic buffer con-

tains the date and time the event was

logged, and a description.

The maximum number of entries is de-

pendent on the CPU. A maximum of 50

entries is supported.

Only the 10 most recent events in the

diagnostic buffer are stored permanent-

ly. Resetting the CPU to the factory set-

tings resets the diagnostic buffer by

deleting the entries.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK