5
ACCESS VIA NETWORK MODULES
5.3 MELSECNET/H Module Access Function
5.3.5 Link data transfer processing time specifications
5
- 37
1
O
V
ER
VI
E
W
2
SY
STEM
CONFIGURA
TION
3
SP
ECIFICA
T
IONS
4
FUNCTIONS
5
A
C
C
E
SS V
IA
N
E
TW
OR
K
MODUL
ES
6
P
R
EP
AR
A
T
OR
Y
PROCE
DUR
ES
A
ND
S
E
TTING
7
I/O NUM
BER
ASS
IGN
M
EN
T
8
M
E
M
O
RIE
S
A
ND
FI
L
E
S
2) Using direct access
By using direct access for link devices that are infrequently used on its own
station and excluding these from the link device refresh ranges, the link device
refresh time can be reduced.
(4) Reducing the link scan time
The link device refresh data and link scan data (LB/LW) can be reduced by assigning
normal cyclic transmission data that are not time-critical to the extended area (2000
H
to 3FFF
H
) for low-speed cyclic transmission.
Figure 5.35 Reducing link device refresh time
Figure 5.36 Reducing the link scan time
C Controller
module
Internal link device
buffers
Link device
refresh
Direct access
Direct access
Link device
refresh
MELSECNET/H module
Network range
assignment parameters
Internal
buffer access
Internal
buffer access
C Controller
module
User program
Processing that needs constant
writing
(frequently used link device)
Processing of which data are
written when needed
(infrequently used link device)
Processing that needs constant
reading
(frequently used link device)
Processing of which data are read
when needed
(infrequently used link device)
Range for sending
to another station
Range for receiving
from another station
Station
No.1
Station
No.3
Station
No.2
Station
No.1
Station
No.3
Station
No.2
Station
No.1
Station
No.3
Station
No.2
1FFF
H
3FFF
H
2000
H
C Controller
module
Internal link device
buffers
MELSECNET/H module
Network range
assignment parameters
Link device
refresh
Normal cyclic
transmission range
Low-speed cyclic
transmission range
Low-speed link refresh
0
H
0
H
Summary of Contents for Q06CCPU-V
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