Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1323

■Tracking processing (2)
• The set value (SV) is inversely transformed from the engineering value and SVn' is calculated (refer to the following
expression).
100
SV '= ×(SV -RL)
n n
RH-RL
• Tracking processing is performed when all of the following conditions are satisfied.
• 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
• 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.
■MV correction (3)
The instruction calculates the deviation (DV) based on the input value (E1) and the set value (SVn') after tracking, and then
calculates the MV correction value (MV').
• The deviation (DV) is calculated under the following conditions.
Condition
Direct action (PN = 1)
Reserve action (PN = 0)
• The MV correction value (MV') is calculated under the following conditions.
Condition
DVHS0
DV-HS0
-HS0<DV<HS0
■MV output (4)
The manipulated value (MV (BW)) is calculated under the following conditions.
Condition
CMV, MAN, CMB, LCM
CSV, CCB, CAB, CAS, AUT, LCC, LCA
■Two-position (on/off) control (5)
The BB operation result (BB1) is output under the following conditions.
Condition
|BW|  50%
|BW| < 50%
■Loop stop processing (6)
The following processing is performed according to the SPA status of the alarm detection (ALM).
SPA status Processing details
1 The loop stops. When the loop stops, the following operations are performed and the S.ONF2 instruction ends.
The output value (BW) is held.
• The control mode (MODE) is set to MAN.
The output result (BB1) value is set to 0.
0 The loop runs and "control cycle determination processing (7)" is performed.
■Control cycle determination (7)
• If the specified control cycle is not reached, the following processing is performed.
Control mode (MODE)
CSV, CCB, CAB, CAS, AUT, LCC,
or LCA
MAN, CMB, CMV, or LCM
• If the specified control cycle is reached, "SV setting processing (1)" is performed.
DV
E1-SV
n'
SV ' - E1
n
MV'
100%
0%
Last value (BW value)
BW
BW=MV
n
BW=MV'
MV =BW
n
BB1
1
0
Processing
The output value (BW) is held and the S.ONF2 instruction ends.
"Three-position (on/off) control (5) is processed assuming that the output value (BW) equals the manipulated value
(MV).
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
11
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