Fisher FIELDVUEDVC6200f Instruction Manual page 210

DVC6200f Digital Valve Controller
AO Function Block
February 2017
Figure E‐2. Analog Output Function Block Schematic
RCAS IN
Operator
Setpoint
CAS IN
SP LOW LIM
SP HI LIM
B2717
Modes
The Analog Output function block supports the following modes:
D Manual (Man)—You can manually set the output to the I/O channel through the OUT [9] attribute. This mode is used
primarily for maintenance, calibration and diagnostics.
D Automatic (Auto)—The block output (OUT [9]) reflects the target operating point specified by the setpoint (SP [8])
attribute. Typically the setpoint is set by the user.
D Cascade (Cas)—The SP [8] attribute is set by another function block through a connection to CAS_IN [17]. The SP [8]
value is used to set the OUT [9] attribute automatically. This is the most frequently used mode in the digital valve
controller.
Note
The transducer block must be in Auto for the mode to go to AUTO, CAS, MAN, or RCAS.
D RemoteCascade (RCas)—The SP [8] is set by a host computer by writing to the RCAS_IN [28] parameter. The SP [8]
value is used to set the OUT [9] attribute automatically.
210
RCAS OUT
SP RATE DN
SP RATE UP
SP SP
HI/LO Rate
Limit Limit
SP WRK
PV SCALE
MODE
Shed
Mode
Access
Analog
Input
Position
Feedback
READ BACK
PV
Convert
and Status
Calculation
IO OPTS
Access
CHANNEL
Analog
Output
Analog
Output
Instruction Manual
BKCAL OUT
OUT
D103412X012