Samson 3730-5 - Attachment to the control valve - Mounting parts and accessories

• 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_OPTIONS 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 solenid 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)
Parameter description (Fig. 3)
Control valve
FINAL_VALUE Reference variable of upstream AO Function Block (control valve)
FINAL_POS_VALUE Valve position after decharacterization
WORKING_SP Reference variable after scaling, characterization, end position function
(corresponds to the reference variable of the control algorithm)
WORKING_POS Actual valve position
READBACK_SELECT Select parameter which is issued to READBACK of AO Function Block.
On/off valve
FINAL_VALUE_D Discrete reference variable of upstream DO Function Block
FINAL_POS_VALUE_D Discrete valve position after taking the direction of action into account
WORKING_SP_D Reference variable after taking the direction of action into account (corre-
sponds to the reference variable of the control algorithm)
WORKING_POS_D Actual discrete valve position
Refer to page 45 for the list of parameters
18 KH 8384-5 EN
FOUNDATION™ fieldbus parameters