Omron NT631C manual 139

Memory Initialization Section 6-4

The maximum number of records is 256 for sort by occurrence (order of error occurrence) and 255 for sort by frequency (order of the number of times each error has occurred).

Use the alarm history record initialization function to reset the alarm history record data to 0, for example when the screen data has been changed, etc. Also, if Screen (Use Ring Buffer) under History Setting in the PT Environment Settings – System Settings has not been checked, no more records will be stored after the maximum number of records has been kept, and therefore the records must be periodically initialized. If Screen (Use Ring Buffer) is checked, when the maximum number of records is reached the oldest record is deleted and the newest data is recorded.

Reference: The NT631/NT631C also allows the alarm history record data to be initialized by controlling the PT status control area from the host. For details, refer to 2- 2-1 PT Status Control Area in the Reference Manual.

139