
3Ć35 Theory of Operation: Point Processing
Original Ć June 1990 CE4.2:CL6211
Figure 3Ć11Ć6. P/PD Auto/Man/DDC or SUP Loop Point Block Diagram
TO DATA
HIGH OR LOW (C)
TRIP POINT (T)
DEADBAND (T)
ALARM
C
ALARM
B
HIGH OR LOW (C)
TRIP POINT (T)
DEADBAND (T)
TRIP POINT (T)
DEVIATION
ALARM (0)
ALARM B (0)
NOTE: ONLY ONE
DEADBAND MAY BE
SPECIFIED FOR ALL
THREE ALARMS.
DEVIATION
ALARM
SSS SSS
SS
REVERSE OR
DEVIATION
CONTROL
ACTION
S
S
PV (0)
VALVE
ACTION
SP TRACKS
IN DDC
SP TRACKS
IN MAN
RESTART
LAST SP
TRACK
CONTROL
INCREASE
OPEN/CLOSE (T)
S
S
OUTPUT
TRACKING
IVP
LIMITS
VALVE
ACTION
CONTROLLER
CURRENT
OUTPUT
OUTPUT TRACKING/NORMAL? (O)
IVP HIGH LIMIT (T)
IVP LOW LIMIT (T)
INCREASE OPEN/CLOSE (T)
IVP (0)
SSS S
SUPERVISORY CONTROL
FROM DATA HIGHWAY
SET POINT
TRANSFER
TO OPERATOR
YES OR NO (C)
RESTART
RESTART
LAST IVP
OUTPUT
TRANSFER
SS
MODE
MODE (O)
YES OR NO (C)
RAMP TIME (T)
SS
TO DATA HIGHWAY
DDC CONTROL
P
BIAS
GAIN (T)
RATE (T)
BIAS VALUE (O)
RESTART LAST BIAS? (C)
RESTART BIAS (T)
MODE
LOGIC
COMPUTER BACKUP
RESTART LAST MODE? (T)
RESTART MODE (T)
YES OR NO (C)
S
YES OR NO (C)
YES OR
NO (C)
RESTART
SET POINT (T)
SS
P/PD Auto/Man/DDC or SUP Controller Block Diagram
SSS
MANUAL OUTPUT (O)
FROM CONSOLE OR
S SSSS
D
OUTPUT
OVERRIDES
MANUAL? (C)
DEADBAND (T)
ADD
RAMPING
TO DATA
TO OPERATOR
TO OPERATOR
FROM DATA
HIGHWAY
MODE? (T)
CONTROL FROM
STATION AND
DIRECT (T)
TRACKING
NOTES:
(C)
(T)
(O)
CONFIGURE
TUNE
OPERATE
ANALOG SIGNALS
DISCRETE SIGNALS
TRANSFER
RAMPING
IVP (T)
ALARM C (0)
TO
OPERATOR
STATION
OR
ALARM B OR C (0)
LOCAL SET POINT (O)
FROM CONSOLE OR
OPERATOR STATION
BIAS
DISPLAY
BIAS
VALUE
S
BIAS VALUE (O)
TO DATA
HIGHWAY
TO OPERATOR
STATION
S
YES OR NO (O)
WATCHDOG
TIMER
RESET
NOTE:RATE ACTION
ON PV ONLY
HIGHWAY
HIGHWAY
DATA HIGHWAY
OPERATOR STATION
STATION AND
DATA HIGHWAY
YES OR NO (C)
TIMEOUT TIME (T)
SS
OPERATOR
STATION OR
CONSOLE
STATION AND
DATA HIGHWAY
TRACK
VALUE
PROCESS
VARIABLE
INPUT
OUTPUT
TRACK
LOGIC
RESET
SP (0)
SET POINT
LIMITS
SP HIGH
LIMIT (T)
SP LOW
LIMIT (T)
SS
TO OPERATOR
STATION AND
DATA HIGHWAY
YES OR NO (C)
VELOCITY LIMIT (T)
SET POINT
VELOCITY
LIMIT
DEVIATION
OUTLET SVA
INLET SVA
SEE NOTE A
NOTE A: FEEDFORWARD FUNCTION
LOCATION; REFER TO FST
SECTION FOR DESCRIPTION
OF FDFW FUNCTIONS
SS
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