135
Fault State
AO Function Block
Fault State
As for Fieldbus-enabled positioners including the FVP110, not only a power failure but
also other errors (such as a communication error) can cause the fail-safe action. For
example, when the status of the CAS_IN input of the AO block from its upstream block
indicates a specific status, such as a communication error, the case is regarded as an
abnormality and fault state actions including a mode change are enacted.
When any of the following status exists for the moment of time specified in
FSTATE_TIME, the block goes to the fault state and the mode changes to LO mode:
❑
Target mode is Cas, and the status of CAS_IN is
Bad: No Comm
❑
Target mode is Cas, and the status of CAS_IN is
Good: IFS
❑
Target mode is RCas, and the status of RCAS_IN is
Good: IFS
In LO mode, the block holds the output (OUT) or outputs FSTATE_VAL, according to
the setting of IO_OPTS. The factory setting is to hold the output.
Backward Path
The backward path functions as:
1. The valve position signal from the transducer block is written to the AO block
parameter READBACK.
2. Is scaled based on XD_SCALE and PV_SCALE for conversion to the process
variable PV.
3. The value of PV is fed back to the PID block or an upper-level system as the valve
position signal via the parameter BKCAL_OUT and RCAS_OUT.
If SIMULATE is set to
Enable
, the value of SIMULATE.Simulate_Value is always set in
READBACK.
SIMULATE contains the following data:
Simulate Status
Status to be set in simulation mode.
Simulate Value
Value to be set in simulation mode.
Transducer Status
Status of input from transducer.
Transducer Value
Value of input from transducer.
Enable/Disable
Whether to enable
2
or disable
1
simulation.
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 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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