Emerson Fisher FIELDVUE DVC6000f Instruction Manual page 144

DVC6000f Digital Valve Controllers
FF VAL
BKCAL IN
TRK IN D
RCAS IN
4
CAS IN
Operator
Setpoint
IN
TRK VAL
B2721 / IL
Service. The BLOCK_ERR [6] parameter shows Out
of service.
You can configure the Man, Auto, Cas, and OOS
modes as permitted modes for operator entry.
Mode Handling
Shed Options—RCAS Mode Only
Shed from or climb to a remote mode is determined by
the parameter SHED_OPT [34]. A block climbs and
4-84
FF GAIN
FF SCALE
Feedforward
Calculation
MODE
RCAS OUT
Setpoint
Limiting
PID
Equation
SP HI LIM GAIN
RATE
SP LO LIM
SP RATE DN RESET
SP RATE UP
Alarm
Detection
Scaling
and
Filtering
HI HI LIM
HI LIM
DV HI LIM
DV LO LIM
LO LIM
PV SCALE
LO LO LIM
PV FILTER
Convert
TRK SCALE
OUT SCALE
Figure 4-12. PID Function Block Schematic
ROUT OUT
ROUT IN
Output
Limiting
OUT HI LIM
OUT LO LIM
OUT SCALE
Operator
Output
sheds through the same path. For example, if
SHED_OPT [34] specifies that a block should shed to
Auto, then, if the block target mode is set to RCas, the
block goes through Auto on the way to RCas. You can
configure the shed option as follows:
Shed With Return Options
Remote cascade or remote output connection failure
shifts actual mode but keeps trying to restore remote
cascade or remote output (in other words, the remote
cascade or remote output target mode stays in effect).
Normal—On failure of a remote connection, the block
attempts to attain the highest permitted non-remote
mode until the remote connection is restored. Cas is
the highest permitted non-remote mode and Auto is is
BKCAL OUT
OUT
December 2009