Emerson Fisher FIELDVUE DVC6000f, Instruction Manual

Page: 213 / 384

DO Function Block
December 2009 4-153
Fault State is set, the OUT_D [9] value goes to either
the FSTATE_VAL_D [20] value or holds its last
position, depending on I/O_OPTS [14]. When the
block has a target mode of CAS, a fault condition will
be detected if the CAS_IN_D [17] has a BAD status or
an Initiate Fault State substatus is received from the
upstream block.
FSTATE_VAL_D [20]: Determines the OUT_D [9]
value if IO_OPTS [14] “Fault State to Value” is
selected. The OUT_D [9] value transitions to
FSTATE_VAL_D [20] after FSTATE_TIME [19]
elapses and the fault condition has not cleared.
Simulation
To support testing of the control strategy, you can
enable the SIMULATE_D [17] parameter. Normally,
the valve position value and status used for
READBACK_D [16] in the DO block reflect actual
process values to the nearest 5%, as provided by the
transducer block. When the SIMULATE_D [17]
parameter is enabled, value and status used for
READBACK_D [16] is supplied by the user manually.
To enable simulation in the DO function block, the
simulate jumper must be installed. For information on
the installation of this jumper, see the page 2-28
Installation section.
Note
When simulate is active, the output
block no longer writes values to the
transducer block. If the Output Blk
Timeout period is exceeded, the
transducer block may move the valve
to the Zero Power Condition
depending on the configuration of the
Output Block Timeout Alert.
The SIMULATE_D [10] parameter has three
components:
Simulate Enable_Disable determines whether the
function block will use the actual valve position value
and status, or Simulate Value and Simulate Status.
Transducer Value and Status reflect the process
values provided by the transducer block.
Simulate Value and Status may be entered by
the user when Simulate Enable_Disable is set to
Enabled.
To use simulate, first install the simulate jumper in the
terminal box, then set Simulate Enable_Disable to
Enabled, then enter the desired values for Simulate
Value and Status.
When SIMULATE_D [10] is Enabled, the Simulate
Active bit of the BLOCK_ERR [6] parameter is set
(refer to the Block Errors description). When the
simulate jumper is installed, the Simulate Jumper bit of
the transducer block parameter SELFTEST_STATUS
[78] is set.
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