Mitsubishi Electric Q12DCCPU-V - Page 196

5 - 42
5.4 CC-Link IE Controller Network Module Access Function
5.4.2 Link device access
5
ACCESS VIA NETWORK MODULES
5.4.2 Link device access
The link devices of a CC-Link IE controller network module controlled by the C Controller
module can be accessed for data reading or writing from the user program on the C
Controller module.
To access from the user program to the link devices, two different methods are available:
the internal buffer access and the direct access.
(1) Internal buffer access
(a) What is the internal buffer access?
The internal buffer access is a method of accessing the internal link device buffers
in the C Controller module.
To use this method, the refresh parameters must be set in the <<Parameter
settings>> tab of CC IE Control utility.
(b) Internal link device buffers
1) Internal link device buffers
• The internal link device buffer is reserved for each of four CC-Link IE
controller network modules.
• Each of the internal link device buffers (LX, LY, LB, and LW buffers) has
the same area size as the corresponding link device (LX, LY, LB, and LW).
Set refresh ranges on the Refresh parameter settings screen activated
from the <<Parameter settings>> tab of CC IE Control utility.
• The internal link device buffers are refreshed with the link device data by
link device refresh.
Figure 5.40 Link device access
Q12DCCPU-V
Q06CCPU-V Q06CCPU-V-B
LW buffer
LB buffer
ret = QBF_WriteLinkDevice();
ret = mdSend();
ret = mdRandW();
ret = mdDevSet();
ret = mdDevRst();
or
/* Data write */
ret = QBF_ReadLinkDevice();
ret = mdReceive();
ret = mdRandR();
or
/* Data read */
Internal
buffer access
Internal link
device buffers
Link device
refresh
Direct
access
LX buffer
LY buffer
SW
*1
SB
*1
LW
LB
LX
LY
*1 Link device refresh is not
available for the link
devices SB/SW.
Use the direct access.
C Controller module
User program
Link devices
CC-Link IE controller network
module