Limit Values - Endress+Hauser iTEMP TMT 165 FOUNDATION Fieldbus Betriebsanleitung

11 Appendix
126
• Parameter group XD_SCALE (see page 135)
XD_SCALE 0 %
XD_SCALE 100 %
XD_SCALE UNIT
• Parameter group OUT_SCALE (see page 134)
OUT_SCALE 0 %
OUT_SCALE 100 %
OUT_SCALE UNIT
The result is that with an input of, for example 100°C a value of 50% is output via the
parameter OUT.
Fig. 11-3: Parameter in Analogue Input Function Block

11.6.10 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 (see page 130)
– LO_LO_LIM (see page 132)
11.6.11 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
parameter BLOCK_ALM (see page 129). The parameter ACK_OPTION (see page 127)
specifies whether an alarm must be confirmed via the fieldbus host system.
The following process alarms are generated by the Analogue Input Function Block:
• Block process alarms
A block process alarm is triggered via the parameter BLOCK_ERR (see page 129).
The parameter BLOCK_ALM (see page 129) 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 Analogue 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 (see page 127), the process alarms must be acknowledged
FOUNDATION Fieldbus temperature transmitter
= 0
= 200
= °C
= 0
= 100
= %
– HI_LIM
– LO_LIM
(see page 131)
(see page 132)
Endress+Hauser