Supplementary Documentation
Page 33 of 44
IFC090, IFC090 i with FF
IFC090-FF Configuration
IFC090 FF 01/2005
KROHNE Messtechnik GmbH & Co. KG · Ludwig-Krohne-Str. 5
D-47058 Duisburg
Tel.: 0203-301 309
Fax: 0203-301389 · E-mail: [email protected]
STATUS_OPTS
Description
Uncertain if Limited
Sets the OUT status to Uncertain if the channel value is limited or one of the
alarm limits are exceeded.
BAD if Limited
Sets the OUT status to BAD if the channel value is limited or one of the alarm
limits are exceeded.
Uncertain if Man mode
Sets the OUT status to Uncertain if the current mode of the Analog Input Block
is Manual (Man).
NOTE:
If this option isn’t enabled, the status of the channel value is used with
constant limit.
The alarm limits mentioned in the former table refer to the alarms specified by the parameters
HI_HI_LIM/HI_HI_PRI, HI_LIM/HI_PRI, LOW_LIM/LOW_PRI, and LOW_LOW_LIM/LOW_LOW_PRI (see 5.3.6)
5.3.6 Process
Alarms
In most flow measurement applications, there are certain measurement values that can cause problems, e.g. a
high limit (within the devices range) that may not be exceeded, otherwise other downstream devices could be
damaged, or a low limit that may not be remain below, otherwise the production process is in danger to be
interrupted.
For these purposes, the Fieldbus Foundation specified the following Analog Input Block process alarms:
High Limit (HI_LIM, HI_PRI
→
HIGH_ALM),
High High Limit (HIGH_HIGH_LIM, HIGH_HIGH_PRI
→
HIGH_HIGH_ALM),
Low Limit (LOW_LIM, LOW_PRI
→
LOW_ALM), and
Low Low Limit (LOW_LOW_LIM, LOW_PRI
→
LOW_LOW_ALM).
Each of these alarms can be configured by the user, by setting the corresponding limit values (xxx_LIM, relative
to OUT). In accordance to the following table of alarm priorities (xxx_PRI), the process alarms will be set and
reported to the control system:
xxx_PRI
Description
0
Alarm is never reported and don’t have to be acknowledged by user.
1
Alarm has been evaluated, but don’t have to be acknowledged by user.
2-7
Alarm has been evaluated and reported according to the given priority (2 = low and 7 =
high).
The status of OUT changes to Good(NC):UnackAdvisoryAlarm:HighLimited.
8-15
Alarm has been evaluated and reported according to the given priority (2 = low and 7 =
high).
The status of OUT changes to Good(NC):UnackCiticalAlarm:HighLimited.
The current status of these alarms can be observed by referencing the associated process alarm parameters
HI_ALM, HI_HI_ALM, LOW_ALM, or LOW_LOW_ALM.
