Instruction Manual
D103412X012
Detailed Setup—DI Function Block
July 2013
204
the detected position. Figure 4‐31 illustrates the operation of the proximity detection function. Travel Alert Point
refers to Travel Lo Alert Point, Travel Hi Alert Point, Travel Lo Lo Alert Point, and Travel Hi Hi Alert Point in table 4‐79.
Travel Alert Deadband refers to Travel Lo Alert Deadband, Travel Hi Alert Deadband, Travel Lo Lo Alert Deadband, and
Travel Hi Hi Alert Deadband in table 4‐79.
Figure 4‐31. Discrete Input Proximity Detection Function
DISCRETE INPUT SET
DISCRETE INPUT
CLEARED
TRIGGER POINT FOR DOWNWARD VALVE
TRAVEL DETERMINED BY TRAVEL ALERT
DEADBAND
TRIGGER POINT FOR UPWARD VALVE TRAVEL
DETERMINED BY TRAVEL ALERT DEADBAND
DEADZONE, 1% OF TRAVEL
Valve Position
CENTER POINT OF PROXIMITY DETECTION
DETERMINED BY TRAVEL ALERT POINT
0= Not Active, 1= Active
Table 4‐79 lists the transducer block parameters used for proximity detection with DI block channels 30 through 33.
Table 4‐79. Transducer Block Parameters Used with Discrete Input Function Block Channels 30 through 33
Transducer Block Parameter Parameter Function
Travel Lo Lo Alert Point Lo Lo Proximity Detection Center Point
Travel Lo Lo Alert Deadband Lo Lo Proximity Detection Width
Travel Lo Alert Point Lo Proximity Detection Center Point
Travel Lo Alert Deadband Lo Proximity Detection Width
Travel Hi Alert Point Hi Proximity Detection Center Point
Travel Hi Alert Deadband Hi Proximity Detection Width
Travel Hi Hi Alert Point Hi Hi Proximity Detection Center Point
Travel Hi Hi Alert Deadband Hi Hi Proximity Detection Width
Field Value Processing
The Invert bit of the IO_OPTS [13] parameter may be used to logically invert the value of FIELD_VAL_D [17] before it is
stored as PV_D [7]. PV_FTIME [16] may
be used to set the length of time that FIELD_VAL_D [17] must be in a new state before that new state is reflected in
PV_D. The PV_D [7] value goes to the mode switch where it becomes OUT_D [8] when the actual mode is AUTO.
OUT_D [8] is also tested for an alarm state.
Note
Invert is the only I/O option that the DI block supports. You can set the I/O option only when the block mode is Out of Service.
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