125
Tight-shut and Full-open Actions
Transducer Block
Tight-shut and Full-open Actions
The tight-shut action decreases the output pressure to a level much lower than the 0%
pressure level for an air-to-open valve (or increases it to a level much higher than the
0% pressure level for an air-to-close valve) when FINAL_VALUE.value is less than
FINAL_VALUE_CUTOFF_LO in order to ensure that the valve is tightly shut off. After
the tight-shut action is activated, when FINAL_VALUE.value becomes greater than
FINAL_VALUE_CUTOFF_LO by 1% or more, the tightshut action turns off.
Conversely, the full-open action increases the output pressure to a level much higher
than the 100% pressure level for an air-to-open valve (or decreases it to a level much
lower than the 100% pressure level for an air-to-close valve) when
FINAL_VALUE.value is larger than FINAL_VALUE_CUTOFF_HI in order to ensure that
the valve is fully open. After the full-open action is activated, when FINAL_VALUE.value
becomes less than FINAL_VALUE_CUTOFF_HI by 1% or more, the fullopen action
turns off.
Although the actual output signal level is changed to a level outside the range during
the period when the tight-shut or full-open action is on, the value of
FINAL_VALUE.value remains as computed and is not affected by these actions.
Backward Path
The following describes the signal input from the device hardware to the transducer
block, which is then passed to other function blocks.
FINAL_POSITION_VALUE
The parameter FINAL_POSITION_VALUE contains a percentage value of the valve
position sent from the position sensor where 0% is the shut-off position as is the case
for FINAL_VALUE.value. When one or more of the following conditions become true,
the data status of FINAL_POSITION_VALUE becomes Bad, which is sent to the
connected AO block and upstream function blocks:
❑
Bad - Out of service: The block is in the O/S mode.
❑
Bad - Sensor failure: The position sensor has failed.
❑
Bad - Device failure: The A/D converter has failed.
❑
Bad - Non specific: The deviation exceeds the limit.
Summary of Contents for FVP110
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Page 97: ...81 Dimensions Standard Specifications Dimensions Figure 46 Single Acting Actuator Dimensions ...
Page 99: ...83 Dimensions Standard Specifications Figure 48 Terminal Configuration ...
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Page 115: ...99 View Object Configuration Table 11 View Object for Transducer Block continued ...
Page 117: ...101 View Object Configuration Table 18 View Object for AO Function Block ...
Page 119: ...103 View Object Configuration Table 20 View Object for OS Function Block ...
Page 121: ...105 View Object Configuration Table 22 View Object for Resource Block ...
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Page 239: ...223 LM Parameter List Link Master Functions ...
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Page 262: ...FVP 110 Fieldbus Valve Positioner Manual 246 GE Energy Table 85 Download Error Codes ...
Page 265: ...249 Comments on System Network Software Download Table 88 DOMAIN_DESCRIPTOR ...
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Page 289: ...273 H Customer Maintenance Parts List ...
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