Mitsubishi Electric MELSEC iQ-R Series - Page 1329

11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
1327
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.
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.)
■SV setting processing (1)
The following processing is performed depending on the control mode (MODE) setting.
Operand: (s3)
Device 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/
system
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
MODE
SPA
CT
E1
BB1
(1)
(2)
(3)
(4)
(6)
(6)
(7)
BB2
(5)
MV
correction
MV
output
Three-position
(on/off) control
Reached
Not reached
Tracking
SV setting
Control cycle
determination
Loop stop
determination
Loop stop
processing
Mode
determination
RUN (SPA=0)
STOP (SPA=1)
BW=Last value
MAN, CMB, CMV, LCM
Other than MAN, CMB, CMV, LCM
(When used)
MV
DV
HSO HS1
RL, RH
SV
n
= ×E2+RL
100
RH-RL