11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
1243
11
■Set value
The set value (E2) is valid only when b0 of the set value pattern (SVPTN) is set to 0 (Used). To use the upper loop MV as the
set value (E2), specify the device (offset +12) where the manipulated value (MV) of the upper loop is set.
If E2 is not used, specify a dummy device (SD820).
■Execution cycle (T)
Set the execution cycle (T) in SD816 and SD817 in single-precision real number.
This instruction performs two-degree-of-freedom PID control operation when the specified control cycle is reached.
At this time, the instruction also performs the following processing steps: SV setting, tracking, gain (Kp) operation, and
deviation check.
The following is the processing block diagram of the S.2PID instruction. (The numbers (1) to (7) in the diagram indicate the
order of the processing.)
■SV setting processing (1)
The following processing is performed depending on the control mode (MODE) setting.
Operand: (s3)
Position Symbol Name Recommended range Data type Standard
value
Set by
+0
+1
E2 Set value -10 to 110 [%] Single-precision
real number
0.0 User
Control mode (MODE) setting 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.
E2
BW
MAN
BW=0
BW=0
MODE
SPA
CT
E1
AND
DVLA
ERRI
¸DVLI
BB1
(1)
(4)(2)
(5)
(7)
(6)
(3)
OFF
(6)
RL, RH GW, GG P, D, MTD, CT DVL, DVLSDV
RUN (SPA=0)
STOP (SPA=1)
(When used)
SV setting
Tracking
Gain (Kp)
operation
processing
Deviation
check
Two-degree-
of-freedom
PID operation
Control cycle
determination
Reached
Not reached
Loop stop
determination
Loop stop
processing
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