8 CPU Unit Functions
8-50
NJ-series CPU Unit Software User’s Manual (W501)
This information displays the category of event log. It is used to access error logs from the Sysmac Stu-
dio or an HMI.
Each event log can contain the following number of records. If the number of events exceeds the num-
ber of records permitted, the CPU Unit overwrites the oldest events.
The NJ-series CPU Unit uses a Battery to retain the event logs when the power is interrupted.
The event logs are retained by Battery. They are not retained when there is no Battery.
Periodically export event logs as required.
Event codes are assigned to Controller events by the system in advance according to the type of event.
Event codes are assigned to user-defined events by the user. Controller event codes are 8-digit hexa-
decimal values. You can use the Get Error Status instruction to read the error codes of current errors.
You can assign a decimal number from 1 to 60,000 as the event code for a user-defined event.
Category
Event type Event log category Description
Controller events System log The Controller automatically detects
and records these events. CJ-series
Unit errors are also included.
Access log This is a record of events that have
affect Controller operation due to
user actions.
User-defined events User event log This is a log of events that are
defined by the user.
Number of Records
Event type Event log category Maximum number of records
Controller events System log NJ501-: 1,024 events,
NJ301-: 512 events
Access log
User-defined events User event log
Retaining Events during Power Interruptions
Event Codes
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