11 PROCESS CONTROL INSTRUCTIONS
11.2 I/O Control Instructions
1221
11
■Mode determination (1)
The following processing is performed depending on the control mode (MODE).
■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.
■Variation rate & upper/lower limiter (3)
Variation rates and upper/lower limits are checked for the difference between the temporary MV(T) and manipulated value
(MV), and the data after limiter 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).
*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).
*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 MLA2 of the alarm detection 2 (ALM2) remains 1.
Control mode (MODE) Processing details
MAN, CMB, CMV, LCM
(alarm clear processing)
• 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 ON time conversion processing (5)" is performed.
AUT, CAB, CAS, CCB, CSV, LCA, LCC "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.DUTY instruction is terminated.
Tracking flag (TRKF) status Processing details
1 • 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
0 A temporary MV(T) is calculated according to the following expression.
T=E1+MVP
MVP=T
Condition BB4, DMLA Result (T1)
|T-MV| DML 0 T
(T - MV) > DML 1
*1
MV+DML
(T - MV) < -DML 1
*1
MV-DML
Condition BB3, MLA, MLA2 BB2, MHA, MHA2 MV
T1 > MH 0 1
*2
MH
T1 < ML 1
*3
0ML
ML T1 MH 0 0 T1
To Next Page
Loading...
