Mitsubishi Electric MELSEC iQ-R Series - Page 1276

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11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
■Gain (Kp) operation processing (3)
• The deviation (DV) is calculated under the following conditions.
• The output gain (K) is calculated under the following conditions.
■BPI operation (4)
The BPI operation is performed with the following operational expression.
K
P
: Kgain (P), BT: execution cycle, T
I
: integral constant (I), DV
I
: DV
n
cumulative value, DV
n
: deviation
Note that special processing is performed in the following cases.
■Deviation check (5)
A deviation is checked under the following conditions, and the result is output to the DVLA of the alarm detection (ALM) and
the large deviation alarm (BB1) in the device specified by (d2).
*1 If the DMLI or ERRI of the disable alarm detection (INH) is set to 1, the DVLA of the alarm detection (ALM) and the large deviation alarm
(BB1) are set to 0.
■Loop stop processing (6)
The following processing is performed according to the SPA status of the alarm detection (ALM).
■Control cycle determination (7)
If the specified control cycle is not reached, output value (BW) is set to 0 and the S.BPI instruction is terminated.
If the specified control cycle is reached, "SV setting processing (1)" is performed.
Condition Operational expression
Direct action (PN = 1) DV = E1 - SV
n
'
Reserve action (PN = 0) DV = SV
n
' - E1
Condition Operational expression
|DV|  GW K = GG
|DV| > GW
Item Operational expression
BW(MV)
Condition Processing
In either of the following cases:
1. Integral constant (I) = 0 (T
I
= 0)
2. MHA or MLA of alarm detection (ALM) is 1.
Integral constant (I)  0 (T
I
 0)
Condition Result
DVL < |DV| DVLA = BB1 = 1
*1
(DVL - DVLS) < |DV|  DVL DVLA = BB1 = Last value status hold
*1
|DV|  (DVL - DVLS) DVLA = BB1 = 0
SPA status Processing details
1 The loop stops. When the loop stops, the following operations are performed and the S.BPI instruction ends.
• The output value (BW) is set to 0.
• The DVLA of alarm detection (ALM) is set to 0.
• The control mode (MODE) is set to MAN.
• BB1 of BB is set to 0.
0 The loop runs and "control cycle determination processing (7)" is performed.
K=1-
|DV|
(1-GG)×GW
CT
K
P
×BT×(DV
n
+
T
I
×ΣDV
I
)
CT
T
I
×ΣDV
I
=
Last value
CT
T
I
CT
T
I
×ΣDV
I
= ×(ΣDV
I
+DV
n
)