Fisher FIELDVUEDVC6200f Instruction Manual page 276

DVC6200f Digital Valve Controller
OS Function Block
February 2017
to OUT_2, or goes to Y
11
is false, then OUT_1 goes to Y
Figure E‐17. OUT with LOCKVAL True
OUT 1
0%
100%
50%
SP
Some hysteresis in the switching point may be required because the output may change by a full stroke of the valve.
HYSTVAL [12] contains the amount of hysteresis. If X < = X12-HYSTVAL, OUT_1 may be determined by the calculated
y value. If X12-HYSTVAL < X < X12 and X has not reached X12 since it was less than X12-HYSTVAL, OUT_1 may be
determined by the calculated y value. If X12-HYSTVAL < X < X12 and X has reached X12 since it was less than
X12-HYSTVAL, OUT_1 may be determined by the LOCKVAL setting. If X12 < X, OUT_1 may be determined by the
LOCKVAL setting.
Initialization and Back Calculation Requirements
Refer to figure E‐20, Output Splitter Configuration, where:
PID1 = Upstream driving controller or function block.
Splitter = Split range function block being described.
AO = Receiver of OUT_1 for 0-50% range of SP
PID2 = Receiver of OUT_2 for 50-100% range of SP
Figure E‐20. Output Splitter Configuration
B
BK_CAL_IN
PID1
OUT
CAS‐IN
276
. If LOCKVAL is true, OUT_1 remains at its ending value when X is greater than X
when X is greater than X
11
OUT 1 remains at
end point when
OUT_2 is non‐zero
OUT 2
B
BK_CAL_IN2
OUT2
Splitter BK_CAL_OUT
OUT1
BK_CAL_IN1
Y
.
12
Figure E‐19. OUT with LOCKVAL False
OUT
0%
PID2
CAS‐IN
BK_CAL_OUT
AO
CAS‐IN BK_CAL_OUT
Instruction Manual
1 OUT 2
50%
100%
SP
D103412X012
. If LOCKVAL
12
OUT_1 goes to zero
OUT_2 becomes