Mitsubishi Electric MELSEC Q Series User Manual page 218

● Proper use of dedicated function libraries
For cyclic access to device(s) of the C Controller module (host), use of C Controller module dedicated function and data
refresh function may improve the user program processing performance.
If the block data assurance per data station is enabled, use QBF_WriteDevice/QBF_ReadDevice to access internal user
device(s). Use of the mdSendEx/mdReceiveEx/mdRandWEx/mdRandREx function may cause inconsistency of data.
(7) Devices specified by functions (internal user device)
Internal user devices compatible with each link device are listed below.
The corresponding device numbers (range) are to be set in the refresh parameters.
In the dedicated function libraries, specify a device name defined for each function.
Link device
Link input
Link output
Link relay
Link register
Remote input
Remote Link output
Remote register
Link special relay
Link special register
When any C Controller module dedicated function is used, specify the data refresh memory offset. Specify an
area on which the internal user device(s) is set in the parameter data refresh settings.
216
Internal user device
LX
LY
LB
LW
B
W
RX
RY
RWw
RWr
SB
SW
Specified function device name
Bus interface functions
QBFDev_CCPU_B
QBFDev_CCPU_W
Access by link refresh not allowed.
Use direct access.
MELSEC data link
functions
DevB
DevW