Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1330

■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(HS1+HS0)
DV-(HS1+HS0)
(-HS1+HS0)<DV<(HS1-HS0)
Others
■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
■Three-position (on/off) control (5)
The BB operation results (BB1, BB2) are output under the following conditions.
Condition
BW75%
25% BW<75%
BW<25%
■Loop stop processing (6)
The following processing is performed according to the SPA status of the alarm detection (ALM).
SPA status
1
0
11 PROCESS CONTROL INSTRUCTIONS
1328
11.3 Control Operation Instructions
DV
E1 - SV
SV
MV'
100%
0%
50%
Last value (BW value)
BW
BW=MV
BW=MV'
MV
BB1
1
0
0
Processing details
The loop stops. When the loop stops, the following operations are performed and the S.ONF3 instruction ends.
• The output value (BW) is held.
• The control mode (MODE) is set to MAN.
• The output result (BB1, BB2) values are set to 0.
The loop runs and "control cycle determination processing (7)" is performed.
'
n
' - E1
n
n
=BW
n
BB2
0
0
1