Beck 14-100, Инструкция по эксплуатации

Страница: 53 / 92

53
80-1403-01, Rev. 3
CONTROLLING THE ACTUATOR:
ANALOG OUT
The Analog Out function block provides
cascade control of the actuator. Because this
is a standard Foundation Fieldbus AO function
block, the operation of the block is the same
as other standard AO blocks. Using this block
requires knowledge of the relationship of the AO
parameters to the Transducer Block and the Beck
DCM‑3 configuration.
Two of the AO parameters are particularly
important in the Beck application: CAS_IN and
PV. CAS_IN is read by the DCM-3 as the Demand
signal. PV is read from the DCM-3 as the actual
position of the output shaft.
Both the Demand and the actual shaft position
are also available in the Transducer Block. Demand
is available as Demand % (reference line 15), and
the actual output shaft position is available as
Position % (reference line 13).
Other parameters in the Transducer Block are
related to the Demand and Position. Some of the
parameters modify the actuator performance and
some of the parameters give additional details.
One of the most important Transducer Block
parameters is the parameter for determining the
rotation direction of the output shaft in response to
an increasing Demand signal. This parameter is
in the Info 2 record, and is called Actuator Dir. The
formal name is Info 2: Actuator Dir.
These related parameters are informational:
Demand Unit read-only
Position Unit read-only
Position(deg/in/mm) in for Group 14
CPS Ranges:CPS Output Unit read only
CPS Ranges:CPS Span page 28
MaxTravel(deg/in/mm) page 28
Position Limits: PosLwrLim page 28
Position Limits: PosUprLim page 28
Position Sense:Pres V
Position Sense:Unit
SigDif:DemPosDiff
SigDif:DemPosDiff Unit
Unit Select(deg/in/mm)
These parameters change the operation:
Op Mode
CPS Ranges:CPS Zero%
CPS Ranges:CPS RngLwr
CPS Ranges:CPS RngUpr
Demand Source
Demand Curve
Info 2:Actuator Dir
Info 2:StepSize
Info 2:Max Error
Snsr Dir
Travel(deg/in/mm)