Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1209

■Mode determination (1)
The following processing is performed depending on the control mode (MODE).
Control mode (MODE)
MAN, CMB, CMV, LCM
(alarm clear processing)
AUT, CAB, CAS, CCB, CSV, LCA, LCC
■Input addition processing (2)
A temporary MV(T) is calculated on the basis of the input value (E1=MV). The following processing is performed depending
on the TRKF of INH.
Tracking flag (TRKF)
1
0
■Variation rate & upper/lower limiter (3)
The variation rate and upper/lower limits of the input value (E1=MV) are checked, and the data after the processing and an
alarm are output.
• Variation rate limiter processing performs the following operations, and outputs the result to the output variation rate alarm
(BB4) and the DMLA of the alarm detection (ALM).
Condition
|T-MV|  DML
(T - MV) > DML
(T - MV) < -DML
*1 If the DMLI or ERRI of the disable alarm detection (INH) is set to 1, the output variation rate alarm (BB4) and the DMLA of the alarm
detection (ALM) are set to 0.
• Upper/lower limiter processing performs the following operations, and outputs the result to the output upper limit alarm
(BB2); output lower limit alarm (BB3); MHA and MLA of the alarm detection (ALM); and MHA2 and MLA2 of the alarm
detection (ALM2).
Condition
T1 > MH
T1 < ML
ML  T1  MH
*2 If the MHI or ERRI of the disable alarm detection (INH) is set to 1, the output upper limit alarm (BB2) and the MHA of the alarm detection
(ALM) are set to 0.
Note that the MHA2 of the alarm detection 2 (ALM2) remains 1.
*3 If the MLI or ERRI of the disable alarm detection (INH) is set to 1, the output lower limit alarm (BB3) and the MLA of the alarm detection
(ALM) are set to 0.
Note that the MHA2 of the alarm detection 2 (ALM2) remains 1.
Processing details
• The MHA, MLA, and DMLA of the alarm detection (ALM) are set to 0.
• The MHA2 and MLA2 of the alarm detection 2 (ALM2) are set to 0.
• The alarm bits (BB1, BB2, BB3, and BB4) are set to 0.
• TRKF of INH is set to 1.
• "Output conversion processing (5)" is performed and the instruction ends.
"Input addition processing (2)" is performed.
However, when ALM SEA is 1 and SM817 is on, alarm bits BB1, BB2, BB3, and BB4 are set to 0 and the
S.OUT1 instruction is terminated.
Processing details
• The manipulated value (MV) is stored in the MV internal operation value (MVP).
• The input value (E1) is set to 0. (MV=0)
• TRKF of INH is set to 0.
• A temporary MV(T) is calculated according to the following expression.
T=E1+MVP
MVP=T
A temporary MV(T) is calculated according to the following expression.
T=E1+MVP
MVP=T
BB4, DMLA
0
*1
1
*1
1
BB3, MLA, MLA2
0
*3
1
0
Result (T1)
T
MV+DML
MV-DML
BB2, MHA, MHA2 MV
*2
1 MH
0 ML
0 T1
11 PROCESS CONTROL INSTRUCTIONS
11.2 I/O Control Instructions
11
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