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Reference Manual
00809-0100-4696, Rev AA
September 2004
3-9
Rosemount 848L
Alarms Use the following steps to configure the alarms, which are located in the
Resource Block.
1. Set the resource block to OOS.
2. Set WRITE_PRI to the appropriate alarm level (WRITE_PRI has a
selectable range of priorities from 0 to 15. Set the other block alarm
parameters at this time.
3. Set CONFIRM_TIME to the time, in
1
/32 of a millisecond, that the
device will wait for confirmation of receiving a report before trying
again (the device does not retry if CONFIRM_TIME is 0).
4. Set LIM_NOTIFY to a value between zero and MAX_NOTIFY.
LIM_NOTIFY is the maximum number of alert reports allowed before
the operator needs to acknowledge an alarm condition.
5. Enable the reports bit in FEATURE_SEL.
6. Set the resource block to AUTO.
I/O TRANSDUCER
BLOCK
The 848L is ordered with either Dry Contact, VDC or NAMUR Inputs. Each
input can have a filter which determines the minimum time a contact needs to
be at a given state to be acknowledged as a state change.
The following procedure allows the sensors to be configured:
1. Set MODE_BLK.TARGET to OOS
2. For each Input “n” select the parameter IN_n_CONFIG.FILTER
a. Select the desired filter time in the range of 0 to 128msec
3. Set MODE_BLK.TARGET to AUTO