
18
KH 8384-5 EN
Block model
Parameter description (Fig. 5)
Control valve
FINAL_VALUE
Set point of upstream AO Function Block (control valve)
FINAL_POS_VALUE
Valve position after rescaling
WORKING_SP
Set point after scaling, characterization, end position function
(corresponds to the controlled variable of the control algorithm)
WORKING_POS
Actual valve position
READBACK_SELECT
Select parameter which is issued to READBACK of the AO Function
Block
On/off valve
FINAL_VALUE_D
Discrete set point of upstream DO Function Block
FINAL_POS_VALUE_D
Discrete valve position after taking the direction of action into account
WORKING_SP_D
Set point after taking the direction of action into account (corresponds
to the set point of the control algorithm)
WORKING_POS_D
Actual discrete valve position
See page 43 for parameter list.
7.4
Function blocks
7.4.1
Analog Output Function Block (AO FB)
The AO Function Block processes an analog signal from an upstream block (e.g. PID Function
Block) to an output value that can be used for the downstream Transducer Block (e.g. valve
positioner). It contains scaling functions and ramp functions as well as other functions. The
generated OUT value is forwarded over CHANNEL to the downstream Transducer Block.
The AO Function Block contains its set point SP depending on the mode (MODE_BLK)
−
Manually entered SP (AUTO)
−
Directly from an upstream function block (CAS_IN)
−
Directly from a fieldbus host system (RCAS_IN)
An internal working process value PV is generated from SP, while taking into account:
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