11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
1259
11
■SV setting processing (1)
The following processing is performed depending on the control mode (MODE) setting.
■Tracking processing (2)
• The set value (SV) is inversely transformed from the engineering value and SV
n
' is calculated (refer to the following
expression).
• Tracking processing is performed when all of the following conditions are satisfied.
• If the set value (E2) is the upper loop MV, the TRKF of the disable alarm detection (INH) of the upper loop is set to 1.
■Gain (Kp) operation processing (3)
• The deviation (DV) is calculated under the following conditions.
• The output gain (K) is calculated under the following conditions.
■SPI operation (4)
The SPI operation is performed with the following operational expression.
K
P
: Kgain (P),T
I
: integral constant (I),BT: execution cycle(T)
Control mode (MODE) Processing details
CAS, CCB, CSV • If the set value (E2) is specified, engineering value transformation processing (refer to the
following expression) is performed, and then "tracking processing (2)" is performed.
• If the set value (E2) is not specified, "tracking processing (2)" is performed without
performing engineering value transformation processing.
MAN, AUT, CMV, CMB, CAB, LCM, LCA, LCC "Tracking processing (2)" is performed.
• The tracking bit (TRK) is set to 1.
• The set value (E2) is used.
• The control mode (MODE) is set to any of the following: MAN, AUT, CMV, CMB, CAB, LCM, LCA, or LCC.
E2 = SV
n
'
Condition Operational expression
Direct action (PN = 1) DV = E1 - SV
n
'
Reserve action (PN = 0) DV = SV
n
' - E1
Condition Operational expression
|DV| GW K = GG
|DV| > GW
Item Operational expression
During operating time (ST)
During hold time (sample cycle
(STHT) - operating time (ST))
BW = 0 (Note that the loop tag past value memory is not set.)
SV
n
= ×E2+RL
100
RH-RL
K=1-
|DV|
(1-GG)×GW
BW=K
P
×{(DV
n
-DV
n-1
)+
×DV
n
}
T
I
BT
To Next Page
Loading...
