KEP MMI-1500 Installation & Operation Manual page 186

4. Click OK, the message appears in the Event Log message summary box.
Note: Normally 200 events are stored in the Event Log. Once the Event Log is full, Events are deleted from the
beginning of the list as new Events occur (First-In-First-Out). If more than 200 events are needed, go to the System
Parameters, General Tab, Extra No. of Event: and enter the additional amount is entered here. Up to 2800 additional
logs can be added. For example, if 1000 events need to be logged, enter 800 in this field.
Note: In order to take full use of communication bandwidth, it is recommended that a block of continuous PLC bit
devices be used for the Event Log list. For example: Use Bits 100 to 199 to control the display of all event messages.
In this case, one read command retrieves Bits 100 to 199 all at once instead of one bit at a time.
Storing Event Log Data to Retentive Memory
Normally, Event Log data is stored in temporary memory. Event Log data is lost when power to the unit is lost. Event Log
data can be saved to retentive memory by enabling the System Parameters - The Hardware Tab, EventLog Database
check box. This sets aside a 20 word header area for the database. Events are then stored after that area in retentive
memory as they occur.
System reserved words used in conjunction with this feature:
LW9057 contains the size that is allocated for a single event. This is the size of the largest possible EventLog DataBase
Item.
LW9058-9059 contains the size in words of the EventLog in retentive memory. Keep in mind that once a block of retentive
memory has been reserved, your project cannot use it for other purposes. We recommend that you specify the DataBase
Start Address to be after stored recipes so they are not overwritten with Event Log data.
LB9090 is a bit that clears the event log data in memory. This is used to reset the log once its information has been uploaded
or is no longer useful.
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