7.2 Transducer Blocks
Transducer Blocks link the function blocks to the input and output variables of a field device. For
example, the DI Function Blocks are linked to the physical binary inputs, an internal solenoid
valve, the current valve position or the condensed state of the positioner. This link to the various
Transducer Blocks is made over the CHANNEL parameter of the individual function blocks. The
table below shows how CHANNEL is assigned to the function blocks:
CHANNEL Function Block
1 DI1
2 DI2
3AO
4 MAI
5 MAO
6 DO1
7 DO2
The Transducer Blocks DI TRD, DO TRD, MAI TRD and MAO TRD are implemented according to
the
FOUNDATION™ fieldbus specification and do not contain any manufacturer-specific pa-
rameters.
7.2.1 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 com-
missioning 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 O/S mode can be configured in the XD_OOS_OPT
parameter as follows:
• Hold last value
KH 8384-5 EN 17
FOUNDATION™ fieldbus parameters
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