Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1329

■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).
Operand: (s3)
Device Symbol Name
+0 E2 Set value
+1
■Execution cycle (T)
Set the execution cycle (T) in SD816 and SD817 in single-precision real number.
Processing details
This instruction performs two-position (on/off) control (2-contact ON/OFF) every control cycle.
The instruction also performs the following steps: SV setting, tracking, MV correction, and MV output processing.
The following is the processing block diagram of the S.ONF3 instruction. (The numbers (1) to (7) in the diagram indicate the
order of the processing.)
RL, RH
E1
(1)
E2
SV setting
(When used)
CT
RUN (SPA=0)
(6)
Loop stop
determination
SPA
MODE
■SV setting processing (1)
The following processing is performed depending on the control mode (MODE) setting.
Control mode (MODE) setting
CAS, CCB, CSV
MAN, AUT, CMV, CMB, CAB, LCM, LCA, LCC
Recommended range
-10 to 110 [%]
HSO HS1
(2) (3)
MV
Tracking
correction
(7)
Reached
Control cycle
determination
Not reached
STOP (SPA=1)
Mode
determination
(6)
Loop stop
MAN
processing
Processing details
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.
RH-RL
SV =
n
100
If the set value (E2) is not specified, "tracking processing (2)" is performed without performing
engineering value transformation processing.
"Tracking processing (2)" is performed.
Data type
Single-precision
real number
DV
MV
(4)
MV
output
MAN, CMB, CMV, LCM
Other than MAN, CMB, CMV, LCM
BW=Last value
×E2+RL
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
Standard Set by
value
0.0 User/
system
BW
(5)
Three-position
BB1
(on/off) control
BB2
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