3 Cyclic data exchange
Cyclically transmitted parameters
The following parameters that are transmitted in cyclic data transfer are marked with an as-
terisk (*) in the parameter lists on page 38 onwards.
4
POS_D
Current position of the valve (discrete)
0: Not initialized
1: Closed (x < 0.5 %)
2: Open (x > 99.5 %)
3: Intermediate position
4
RCAS_IN
Setpoint with status: Reference variable w in RCAS mode
Provided by a supervisory host, e.g. PID Block or master class 1. Depending on the mode
of the function block.
Range of values defined in PV_SCALE
4
RCAS_OUT
Setpoint with status: Reference variable w in RCAS mode
Provided to a supervisory host, z. B. PID Block or master class 1. Depending on the mode
of the function block.
Range of values defined in PV_SCALE
4
READBACK
Current position of the valve and status
Controlled variable x in relation to travel range/angle of rotation (OUT_SCALE)
Range of values defined in PV_SCALE
4
SP
The setpoint SP is transmitted to the positioner. Defines the position of the valve between
the open and closed positions.
Range of values defined in PV_SCALE
4
DI_OUT
Output of the DI Function Block
KH 8384-4 EN 7
Cyclic data exchange
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