Endress+Hauser PROline Prosonic Flow 93 Function Manual page 166

4 Analog Input function block


166
4.10 Limit values
The limit values are based on the output value OUT. If the output value OUT exceeds or
undershoots the defined limit values, an alarm is sent to the fieldbus host system via the
limit value process alarms.
The following limit values can be defined:
– HI_HI_LIM (see Page 172)
– LO_LO_LIM (see Page 175)
4.11 Alarm detection and processing
Process alarms provide information on particular block statuses and block events. The
status of the process alarms is communicated to the fieldbus host system via the
BLOCK_ALM parameter, (see Page 169). The ACK_OPTION parameter,
(see Page 167), specifies whether an alarm must be acknowledged via the fieldbus
host system.
The following process alarms are generated by the Analog Input function block:
• Block process alarms
A block process alarm is triggered via the BLOCK_ERR parameter, (see Page 170) .
The BLOCK_ALM parameter (see Page 169) is used to show the block process
alarms and communicate them to the fieldbus host system. The following block
process alarms can be generated by the Analog Input function block:
– SIMULATION ACTIVE
– INPUT FAILURE
– OUT OF SERVICE
– BLOCK CONFIG ERROR
If the option of the process alarm (BLOCK ALM) has not been enabled in the
ACK_OPTION parameter, (see Page 167), the process alarms must be
acknowledged in the BLOCK_ALM parameter, (see Page 169).
• Limit value process alarms
If a limit value is violated then the priority specified for the limit value alarm is checked
before the limit value violation is communicated to the fieldbus host system.
The priority that specifies the action in the event of an active limit value violation is
determined by the following parameters:
– HI_HI_PRI (see Page 172)
– LO_LO_PRI (see Page 176)
The status of the limit value process alarms is communicated to the fieldbus host
system via the following parameters:
– HI_HI_ALM (see Page 172)
– LO_LO_ALM (see Page 175)
If the option of a limit value process alarm has not been enabled in the ACK_OPTION
parameter, (see Page 167), then this must be acknowledged directly in its parameter
(see list).
Note!
The ALARM_SUM parameter, (see Page 169), shows the current status of all the
process alarms.
PROline Prosonic Flow 93 FOUNDATION Fieldbus
– HI_LIM
– LO_LIM
– HI_PRI
– LO_PRI
– HI_ALM
– LO_ALM
(see Page 173)
(see Page 175)
(see Page 173)
(see Page 176)
(see Page 172)
(see Page 175)
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