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Reference Manual
00809-0100-4021, Rev GC
Section 4: F
OUNDATION
fieldbus Configuration
April 2014
Foundation™ fieldbus configuration
4.9.5
Status
When a PV is passed from one function block to another, it passes a STATUS along with the PV.
The STATUS can be: GOOD, BAD, or UNCERTAIN. When a fault occurs in the device, the PV will
look at the last value with a STATUS of GOOD and the STATUS will change from GOOD to BAD, or
from GOOD to UNCERTAIN. It is important that the control strategy that uses the PV also
monitors the STATUS to take appropriate action when the STATUS changes from GOOD to either
BAD or UNCERTAIN.
Status options
Status Options (STATUS_OPTS) supported by the AI block are shown below:
Propagate fault forward
If the status from the sensor is
Bad, Device failure
or
Bad, Sensor failure
, propagate it to OUT
without generating an alarm. The use of these sub-status in OUT is determined by this option.
Through this option, the user determines whether alarming (sending of an alert) will be done by
the block or propagated downstream for alarming.
Uncertain if limited
Set the output status of the Analog Input block to
uncertain
if the measured or calculated value
is limited.
BAD
Set the output status to
Bad
if the sensor is violating a high or low limit.
Uncertain if man mode
Set the output status of the Analog Input block to
uncertain
if the actual mode of the block is
Man.
Note
The instrument must be in Out of Service mode to set the status option.
4.9.6
Advanced features
The following parameters provide the capabilities to drive a discrete output alarm in the event
that a process alarm (HI_HI_LIM, HI_LIM, LO_LO_LIM, LO_LIM) has been exceeded.
ALARM_TYPE
ALARM_TYPE allows one or more of the process alarm conditions (HI_HI_LIM, HI_LIM,
LO_LO_LIM, LO_LIM) detected by the AI function block to be used in setting its OUT_D
parameter.
OUT_D
OUT_D is the discrete output of the AI function block based on the detection of process alarm
condition(s). This parameter may be linked to other function blocks that require a discrete input
based on the detected alarm condition.
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