FVP 110 Fieldbus Valve Positioner Manual
146
GE Energy
Modes
The target mode for the OS function block can be set from three block modes: Cas, Auto,
and O/S. Regardless of the target mode, the OS block automatically enters the IMan
mode when a specified condition is met.
Output Processing
The values of OUT_1 and OUT_2 with respect to the value of SP, which is the value of
the input from the upstream block (CAS_IN) in the Cas mode or the local setpoint value in
the Auto mode, are determined as shown in Figure 64.
Figure 64
Examples of Valve Operation Characteristics
These characteristics are determined by the array element values in parameters:
❑
IN_ARRAY and OUT_ARRAY
❑
IN_ARRAY: [X11, X12, X21, X22]
❑
OUT_ARRAY: [Y11, Y12, Y21, Y22]
Coordinates P1 (X11, Y11) and P2 (X12, Y12) define the start and stop points of the
characteristics for OUT_1, and P3 (X21, Y21) and P4 (X22, Y22) define those for OUT_2.
These two operation characteristics may overlap each other, or start from the same point
and have different slopes; however, all the following conditions must be met at all times.
Settings of IN_ARRAY that do not meet one or more of these conditions cause a
BLOCK_ERR, disabling the block from exiting the O/S mode.
X21 . X11
X12 > X11
X22 > X21
Содержание FVP110
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