
KH 8384-5 EN
17
Block model
7.3
Advanced Positioner Transducer Block (AO TRD)
The Advanced Positioner Transducer Block (AO TRD) contains an output value from an up
-
stream Analog Output Function Block. This value is used to position a control valve. The block
contains parameters to adapt the positioner to the actuator and valve as well as for valve
start-up and diagnostics.
Action on fault detection
The action on fault detection for the "Maintenance alarm" state in the condensed state can be
configured in the XD_FSTATE_OPT parameter as follows:
−
Hold last value
−
Move to fail-safe position
−
Move to fault state value XD_FSTATE_VAL
The action on fault detection to transfer to the O/S mode can be configured in the XD_OOS_
OPT parameter as follows:
−
Hold last value
−
Move to fail-safe position
−
Move to fault state value XD_FSTATE_VAL
The AO Transducer Block (AO TRD) can still set an output error in the AO Function Block. For
this purpose, the following events to activate an output error can be configured in the
ALARM_OPTION parameter.
−
No (never)
−
Local Override (when the AO TRD is in the LOCAL OVERRIDE mode, i.e. the positioner is
set locally in the SAFE mode or an internal solenoid valve is activated)
−
MAN (when the AO TRD is in MAN mode)
−
Block alarm (when the AO TRD has a MAINTENANCE NOW block error)
−
AO TRD fault state (when the action on fault detection is active)
−
AO O/S set fault state (when the AO Function Block in the O/S mode, the valve is
moved to the FSTATE_VAL of the AO Function Block)