ABB 800xA Operation page 230

Device Loop Templet
LOG STATE CHANGES Field
This field provides the means to enable or disable logging of state changes for this
device (that is, an audit trail of device state change messages in a historical archive).
Valid entries are:
YES
NO
DMND PROCESSING MODE Field,
# LOOPS TO PRESCAN Field, and
LOOPS TO PROCESS Field
The DMND PROCESSING MODE field, # LOOPS TO PRESCAN field, and
LOOPS TO PROCESS fields allow you to specify up to 5 loops to process along
with this loop. The DMND PROCESSING MODE field is used to specify whether
the loops are processed when this loop is normally processed or when it is demand
scanned, or both. The # LOOPS TO PRESCAN field determines how many of the
listed loops are scanned before this loop and how many are scanned after. The
LOOPS TO PROCESS fields list the loops for this type of processing.
Valid entries for the DMND PROCESSING MODE field are:
NONE
NORMAL
DEMAND
BOTH
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log state changes for this device. Each time the device loop is
scanned the old and new states are determined. If the old and new
states differ, an attempt is made to send a state change message to
the Alarm/Event package which sends the message to the History
node. If memory cannot be allocated for the state change message,
the History node will display, NOCOMMAND in place of the
missing device states. This indicates to the operator that at least one
state change was not logged.
do not log state changes for this device
no extra processing
process loops as specified in the LOOPS TO PROCESS fields when
this loop is normally scanned
process loops as specified in the LOOPS TO PROCESS fields when
this loop is demand scanned
process loops as specified in the LOOPS TO PROCESS fields when
this loop is demand or normally scanned
Appendix A Runtime Templates
3BUR002418-600 A