History Memory

A non-volatile memory is implemented in the SGM so that the following responses can be logged:

• Which bus originated the incorrect wake-up call that woke the entire system
• Which node prevented the bus system from entering sleep mode following shut down of terminal R and expiration of the run-on time (30 min).

Each entry in the history memory identifies the originator, and logs the time of day and the odometer reading. In this way, dependable diagnosis can subsequently be performed.