DESCRIPTION AND OPERATION
MODES OF OPERATION
I-E96-117B
2 - 11
modes. When the SAC station transfers to manual operation
from cascade, it enters manual basic operation. Figure
shows an example of how function code 80 generates a cascade
set point from an external variable.
Figure 2-5. Module Configuration with Cascade Set Point from External Source
T
T
SET POINT
FROM
PRIMARY
STATION
PRODUCT TEMPERATURE
M/A
MFC/P
APID
F(t)
CISI/O
S1
S2
S2
S1
S1
(3)
(7)
S2
50
75
(156)
80
(156)
80
(80)
151
150
S6
S9
S8
S7
S5
S1
S4
S3
S10
S1
S2
S3
S24
S29
S28
S27
S26
S25
S4
S22
S21
S20
S19
S18
S5
S30
S2
S7
S9
S8
S6
S1
S5
S4
S3
S10
S3
101
(80)
AI1
DI2
DO4
DO3
DO2
DO1
DI3
DI1
AI2
AO2
AO2
AO1
AO1
AI4
AI3
ST
S24
S29
S28
S27
S26
S25
S4
S22
S21
(79)
30
S10
S11
S15
S17
S18
N+9
S16
S20
S19
S18
S5
S30
PRIMARY
STATION
SET POINT
TRACKING
CASCADE
STATION
T00290A
STEAM
FLOW
STEAM FLOW
CONTROL
CASCADE SET POINT
TO CASCADE STATION
PV
SP
SP
A
O
HAA
C-F
TRS2
AO
SP
FF
BD
N/A
N/A
R
PV
CO
TF
BI
TR
DI
II
APID
M/A
MFC/P
C/R
SP
O
C-F
C
A
PV
SP
A
HAA
TRS2
AO
LDA
HDA
LAA
TR
CX
LX
C/R
AX
MI
TS
TRPV
BD
CO
BI
SP
FF
N/A
N/A
R
PV
TF
TR
DI
II
LDA
HDA
LAA
TR
CX
LX
C
C/R
AX
C/R
MI
TS
A
TRPV
FY
FT
FIC
TIC
TT
STEAM
PRODUCT