Limit Values - Endress+Hauser Proline Promag 55 Operating Manual

Device functions Proline Promag 55 FOUNDATION Fieldbus
Endress+Hauser
• OUT_SCALE parameter group
OUT_SCALE 0 %
OUT_SCALE 100%
OUT_SCALE UNIT
The result is that with an input value of, for example, 15 m
parameter OUT.
Transducer
3
0...30 m /h
Fig. 4: Example of rescaling the input value
5.2.9

Limit values

The limit values are based on the output value OUT. If the output value OUT exceeds or does not
reach the defined limit values then 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 (upper alarm limit)
• HI_LIM (upper early warning limit)
• LO_LO_LIM (lower alarm limit)
• LO_LIM (lower early warning limit)
5.2.10 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 parameter BLOCK_ALM. The
parameter ACK_OPTION 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. The parameter BLOCK_ALM is
used to show the block process alarms and communicate them to the fieldbus host system. The
following process alarms can be generated by the Analog Input function block:
– SIMULATE ACTIVE
– INPUT FAILURE
– OUT OF SERVICE
– BLOCK CONFIG ERROR
If the option of the process alarm (BLOCK ALM) has not been enabled in the parameter
ACK_OPTION, the process alarms must be acknowledged in the parameter BLOCK_ALM.
= 0
= 100
= %
Analog Input Function Block
Block
3
m /h
"Flow"
XD_SCALE
30
Volume
Flow
3
15 m /h
0
0
5 Analog Input function block
3
/h a value of 50% is output via the
%
OUT_SCALE
100
%
0
100 0 50 100
OUT
50%
%
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