Rockwell-automation Logix5000 Controllers Controller Information and S Manual de usuario descargar pdf (Pagina 30)

Chapter 3 Controller logging

Controller logging counters

Three counters, listed in the following table, provide real-time statistics about

modifications to the controller.

Counter Name Description Access

Total Entry Count Number of entries added to the log since the last firmware

update.

GSV/SSV

Unsaved Entry Count Number of entries in controller RAM not yet written to the

CompactFlash card.

GSV

Modify Execution Count Count that specifically tracks modifications that can change

behavior of a running controller. A subset of entries increment this

count.

GSV/SSV

Total Entry Count

Total Entry Count is the number of controller entries that have been added since

the last firmware update. This counter increments after any entry is added to the

log, and it is written to the log in the Record Number field. You can use a Set

System Value (SSV) instruction to set it to a known value. This can be useful, for

example, for monitoring system changes during a production run.

The following rung of ladder logic shows how to retrieve the Total Entry Count

by using a Get System Value (GSV) instruction.

30 Rockwell Automation Publication 1756-PM015F-EN-P – October 2014

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Rockwell-automation Logix5000 Controllers Controller Information and S Manual de usuario Pagina 30