Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1276

■Gain (Kp) operation processing (3)
• The deviation (DV) is calculated under the following conditions.
Condition
Direct action (PN = 1)
Reserve action (PN = 0)
• The output gain (K) is calculated under the following conditions.
Condition
|DV|  GW
|DV| > GW
■BPI operation (4)
The BPI operation is performed with the following operational expression.
Item
BW(MV)
K : Kgain (P), BT: execution cycle, T
P
Note that special processing is performed in the following cases.
Condition
In either of the following cases:
1. Integral constant (I) = 0 (T
2. MHA or MLA of alarm detection (ALM) is 1.
Integral constant (I)  0 (T
■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).
Condition
DVL < |DV|
(DVL - DVLS) < |DV|  DVL
|DV|  (DVL - DVLS)
*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).
SPA status
1
0
■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.
11 PROCESS CONTROL INSTRUCTIONS
1274
11.3 Control Operation Instructions
Operational expression
DV = E1 - SV
DV = SV
Operational expression
K = GG
K=1-
Operational expression
CT
K ×BT×(DV +
P n
T
I
: integral constant (I), DV
I
= 0)
I
 0)
I
Result
DVLA = BB1 = 1
DVLA = BB1 = Last value status hold
DVLA = BB1 = 0
Processing details
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.
The loop runs and "control cycle determination processing (7)" is performed.
'
n
' - E1
n
(1-GG)×GW
|DV|
×ΣDV )
I
: DV cumulative value, DV
I n
*1
*1
: deviation
n
Processing
CT
×ΣDV = Last value
I
T
I
CT CT
×ΣDV = ×(ΣDV +DV )
I I n
T T
I I