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MELSEC-Q
3 SPECIFICATIONS
3.3.4 Reduction of the link scan time
The amount of link refresh and link scan data (LB/LW) per END processing can be
reduced by assigning the data in the link devices (LB/LW) for normal cyclic
transmission, which does not require high-speed transmission, to the extension area
(2000
H
to 3FFF
H
), and transmit it by the low-speed cyclic transmission.
(High Performance model QCPU, Process CPU, Redundant CPU, and Universal
model QCPU)
Common
parameters
Q25HCPU
1M
P
1
1N
S
3
1NS2
1N
S
3
1NS2
1M
P
1
Link refresh
Normal cyclic transmission range
0
Low-speed cyclic transmission range
2000
3FFF
1M
P
1
1N
S
2
1N
S
3
1FFF
Low-speed link refresh
3.3.5 Control station shift time
The time required to shift the control station status (control station shift time) can be
calculated from the following expression:
[Control station shift time (Csw)]
Csw=( 12) + ( 11) + ( 3) + 450 [ms]
a b c
a
: Number of normal stations after control station cut-off
b
: Number of abnormal stations after control station cut-off
c
: Set value of constant link scan (Refer to Section 5.4.)
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