rotork Mk3 - Status Feedback Function Block Settings; Analogue Position and Torque Data; Discrete Input Data

Setting Up The FF CP Card
Publication PUB089-005-00_0618 85 of 116
8.5 Status feedback function block settings
The current status of actuator position, active control functions and fieldbus availability are reported in
several parameters of the transducer block and through the Discrete Input and Analogue Input blocks.
The only settings that need be considered are those for limited range positioning.
8.5.1 Analogue position and torque data
Before the actuator can accurately report the position of the valve the actuator Open and Closed limits
must be set and the actuator moved between the fully open (100%) and fully closed (0%) positions. If
the Fieldbus reported positions are required to be a proportion of the available stroke, this reduced
band can be set in the transducer block using indices 50 and 51.
Transducer Block Settings
Param. 50 – Min Position
Set between 0-100% (usually 0%)
Param. 51 – Max Position
Set between 0-100% (usually 100%)
8.5.2 Discrete Input data
The Discrete Input blocks provide actuator status information. This can be read either as a single bit
read from all five DI function blocks or multiple bit reads from one or more blocks, if required.
The following example shows a monitoring configuration where only a single bit read is available.
 DI 1 bit 0 = Actuator at Close Limit.
 DI 2 bit 0 = Actuator at Open Limit.
 DI 3 bit 0 = Actuator selector in Remote.
 DI 4 bit 0 = Actuator has a General Alarm.
 DI 5 bit 0 = Actuator is moving.
The Host DCS will monitor the OUT_VALUE of each of the DI blocks. Each block will be examined for
the change in value from 0 to 1 to detect the present status.
The following example shows a monitoring configuration using multiple bit reads from DI 1.
 DI 1 bit 0 = Actuator at Close Limit.
 DI 1 bit 1 = Actuator at Open Limit.
 DI 1 bit 2 = Actuator is Moving.
 DI 1 bit 3 = Actuator is Closing.
 DI 1 bit 4 = Actuator is opening.
 DI 1 bit 5 = Actuator selector in Remote.
 DI 1 bit 6 = Actuator in Local Stop.
 DI 1 bit 7 = Actuator in Local.
When using multiple bit reads from a single byte the DI will show a numeric value based on the
combined binary values of each bit at logic 1. For example, the number 52 in the OUT_D VALUE
parameter of DI 1 would denote the actuator has Remote selected and is Moving in the open direction,
i.e. bits 2, 4 and 5 are true.