Mitsubishi MELSEC-Q Series User Manual page 131

4
FUNCTIONS
(2) Direct access
(a) Definition of direct access
(b) Directly accessible devices
The direct access is a method for directly accessing the link devices of
MELSECNET/H modules by the user program on the C Controller module,
independently of the link device refresh.
Since the internal link device buffers are not accessed in the case of the direct
access method, no refresh parameters need to be set in the CC IE Control utility.
The following devices are directly accessible.
Table4.14 Directly accessible device list
Access method
Direct access
C Controller module
User program
/* Data write */
ret = QBF_WriteLinkDevice();
or
ret = mdSend();
ret = mdRandW();
ret = mdDevSet();
ret = mdDevRst();
/* Data read */
ret = QBF_ReadLinkDevice();
or
ret = mdReceive();
ret = mdRandR();
4.5 CC-Link IE Controller Network Module Access Function
Accessible device
LX
LY
LB
LW
SB
SW
CC-Link IE controller network module (First module)
Link devices
Direct access
LX
LY
CC-Link IE controller network module
(Second module)
CC-Link IE controller network module
(Third module)
Figure 4.44 Direct access
4.5.2 Link device access
LB
LW
SB
SW
CC-Link IE controller network module
(Fourth module)
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