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) SPI operation
SPI operation is performed with the following operation expression.
Condition Operation expression
During operating time (ST)
K
P
DV
n
}{(DV
n
DV
n-1
)
BT
T
I
BW
During hold time (STHT ST) BW 0 (loop tag past value memory is not set.)
K
P
: K Gain (P), T
I
: Integral constant (I), BT: Execution cycle ( T)
In the following case, however, note that special processing will be performed.
Condition Operation expression
In any of the following cases 1, 2, 3
1. Integral constant (I)
0 (T
I
0)
2. When MH or ML error occurred
(MVP
MH) and
0)DV
n
BT
T
I
(
3. When MH or ML error occurred
(MVP
ML) and
0)DV
n
BT
T
I
(
0DV
n
BT
T
I