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(b) Reading
The link device ranges of network modules can be read.
Writing or reading data by using a link direct device is allowed for only one network module that is on the same network.
If two or more network modules are mounted on the same network, a network module with the lowest slot number is the
target of writing or reading by the link direct device.
For example, if network modules set as station numbers 1 and 2 are mounted on network number 1 as shown in Figure 9.52,
station number 2 is the target of the link direct device.
(4) Differences between link direct devices and link refresh
Description on
programs
Number of steps
Range of network module access
Guaranteed access data integrity
Remark
For network parameters, common parameters, and network refresh parameters, refer to the following.
• Details:
• Setting method:
9 - 42
Figure 9.52 When two or more network module are mounted on the same network
Table9.5 ÉäDifferences between link direct devices and link refresh
Item
Link relay
Link register
Link special relay
Link special register
Network manual for each network module
GX Developer Version 8 Operating Manual
Network No.1
Writing/reading using link direct devices not allowed
Writing/reading using link direct devices allowed
Link direct device
J \K4B0 or higher
J
\W0 or higher
J
\K4SB0 or higher
J
\SW0 or higher
2 steps
J
\
0 to J
\
3FFF
Word (16-bit) units
Link refresh
B0 or higher
W0 or higher
SB0 or higher
SW0 or higher
1 step
Range specified by refresh parameters
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