Flowserve 3400IQ - Manual (Page 17)

Logix 3400IQ Digital Positioner FCD LGENIM3403-00 – 11/07
Stroke Characterization
In addition to three pre-defined and embedded characterization curves, the Logix 3400IQ digital positioner
has a 21-point custom stroke characterization feature. This allows the user to define a unique set of
operating parameters customizable to his process conditions.
Table 2: Transducer Block Characterization Parameters
Parameter Description Value — Meaning Comments
MODE_BLK The operating mode of the
transducer block
Permitted Modes: Auto - Auto
(target mode) OOS - Out of
Service
The transducer block must
be out-of-service before the
user can edit or change
characterization.
1 Quick Opening Curve* Loads factory defined QO
curve as custom curve.
2 Equal Percent Curve Loads factory defined equal
percent curve as custom
curve.
3 Actuator Type
4 Positioner Model
5 ActuatorStyle
6 Custom Characterization
Active Activates custom curve. If
Off, response is Linear.
7 Fail Position
CONTROL_FLAGS Byte values which select
positioner operation
features
8 Air Action
CURVEX Numeric X value array for
custom point. (1x21 array
points)
X-axis value for custom
stroke characterization point.
Range -10 to 110
Pair each X-value with
corresponding Y-value to
define the desired point.
Values must be in
ascending (or equal) order.
CURVEY Numeric Y value array for
custom point. (1x21 array
points) Y-axis value for custom
stroke characterization point.
Range -10 to 110
* Must not be selected if a custom curve is to be created or edited.
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