Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

Page: 1344 / 2110

1342
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
■
Mode check (3)
The following processing is performed depending on the control mode (MODE).
■
Variation rate & upper/lower limiter (4)
The instruction checks the variation rate and upper/lower limit values for the input value 1 (E1) or 2 (E2).
The variation rate limiter conditions are shown below.
*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.
The upper/lower limiter conditions are shown below.
*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.
*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.
■
Output conversion processing (5)
The instruction performs engineering value transformation using the following expression.
■
Tracking processing (6)
Processing is performed when the following conditions are satisfied.
■
Loop stop processing (7)
The following processing is performed according to the SPA status of the alarm detection (ALM).
Control mode (MODE) Processing details
MAN, CMB, CMV, LCM "Output conversion processing (5)" is performed.
The MHA, MLA, and DMLA of the alarm detection (ALM) are set to 0.
The alarm bits (BB1, BB2, BB3, and BB4) are set to 0.
AUT, CAB, CAS, CCB, CSV, LCA, LCC The instruction performs engineering value inverse transformation using the following expression.
"Variation rate & upper/lower limiter processing (4)" is performed.
Condition T' BB4, DMLA
|T-MV
n
|

DML T'=T 0
(T-MV
n
)>DML T'=MV
n
+DML 1
*1
(T-MV
n
)<-DML T'=MV
n
-DML 1
*1
Condition MV BB2, MHA BB3, MLA
T'>MH MV
n
=MH 1
*2
0
T'<ML MV
n
=ML 0 1
*3
ML

T'

MH MV
n
=T' 0 0
Condition Processing
When all of the following conditions are satisfied:
• The control mode (MODE) is set to any of the following: MAN, CMB, CMV, or LCM.
• Tracking bit (TRK) is 1.
E
n
=MV
n
Operation result is output to the input value 1 (E1) or 2
(E2).
When all of the following conditions are satisfied:
• The control mode (MODE) is set to any of the following: AUT, CAS, CAB, CCB, CSV, LCA, or LCC.
• Tracking bit (TRK) is 1.
• BB alarm (BB1) = 1
E
n
=MV
n
SPA status Processing details
1 The loop stops. When the loop stops, the following operations are performed and the S.SEL instruction ends.
• The output value (BW) is held.
• The alarm bits (BB1, BB2, BB3, and BB4) are set to 0.
• The MHA, MLA, and DMLA of the alarm detection (ALM) are set to 0.
• The control mode (MODE) is set to MAN.
0 Processing from "Engineering value transformation (1)" through to "Tracking processing (6)" is performed.
T= × (PV-RL)
100
RH-RL
BW= ×MV
n
+NMIN
100
NMAX-NMIN