7 System Diagnosis
7.6 I/O Message History
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7.6.2 Clearing the I/O Message History 
Use the following operation to clear the I/O message history. 
1. Select {DATA} under the menu.
2. Select {CLEAR HISTORY}.
– The confirmation dialog box appears.
3. Select “YES.”
– The displayed I/O message history is cleared.
 
Initializing the history becomes valid when the security 
mode is higher than the management mode.