User`s manual

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MELSEC-Q
9 CONTROL OPERATION INSTRUCTIONS
(2) Tracking processing
(a) The set value (SV) is converted reversely from the engineering value with the following
operation expression to calculate SVn'.
(SV
n
RL
100
SV
n
'
RH
RL)
(b) When all of the following conditions hold, tracking processing is performed.
1) The tracking bit (TRK) of the operation constant is 1.
2) The set value (E2) is used.
3) The operation mode (MODE) is any of MAN, AUT, CMV, CMB, CAB, LCM, LCA and
LCC.
E2 SVn'
(c) When the set value (E2) is the manipulated value (MV) of the upper loop, the tracking flag
(TRKF) of the alarm detection inhibition (INH) in the upper loop turns to 1.
(3) Gain (Kp) operation processing
(a) The deviation (DV) is calculated under the following condition.
Condition Operation expression
Forward operation (PN 1) DV E1
SV
n'
Reverse operation (PN 0) DV SV
n'
E1
(b) The output gain (K) is calculated under the following condition.
Condition Operation expression
When |DV| GW K GG
When |DV| GW
1
(1
K
|DV|
GG) GW
(4) BPI operation
BPI operation is performed with the following operation expression.
Condition Operation expression
BW ( MV)
K
P
(DV
n
CT
T
I
DV
I
)BT
Kp: K Gain (P), BT: Execution cycle, T
I
: Integral constant (I),
DV
I
: Cumulative value of DVn, DVn: Deviation
In the following case, however, note that special processing will be performed.
Condition
In either of the following cases 1, 2
1. Integral constant (I)
0 (T
I
0)
2. Either MLA or MHA of alarm
detection (ALM) is 1
CT
T
I
DV
I
last value unchanged
1. Integral constant (I) 0 (T
I
0)
DV
n
)
CT
T
I
DV
I
CT
T
I
(
DV
I