4
- 16
4.1 Cyclic Transmission Function
4.1.4 Direct access to link devices
4
FUNCTIONS
Remark
(1) When an address within the link refresh range is specified (for writing)
Although data are written at the time of the instruction execution, after that,
the link device of the CC-Link IE controller network module is overwritten with
the device data of the CPU module by link refresh.
Therefore, write the same data to the CPU module device as well as
accessing directly to the link device.
(3) Differences from link refresh
* 1 In the case of the Q02HCPU
* 2 When the station-based block data assurance setting is enabled
(
Section 4.1.5 Assurance of cyclic data integrity)
* 3 When conditions for 32-bit data integrity assurance are satisfied
(
Section 4.1.5 Assurance of cyclic data integrity)
Figure 4.15 When an address within the link refresh range is specified (for writing)
Table 4.7 Differences from link refresh
Item
Access method
Link refresh
Direct access
No. of steps
1
2
Processing speed
(LD B0
)
*1
High speed (0.034 s)
Low speed (several tens of
10 s)
Data reliability
In units of stations
*2
In units of 32 bits
*3
MOV K20 J1\W100
LW
20
300
100
W
300
100
CC-Link IE controller
network module
CPU module
MOV K20 J1\W100
MOV K20 W100
LW
20
100
W
20
100
Link refresh
Link refresh
Link refresh
Link refresh
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