Mitsubishi Electric QJ71DN91, User Manual

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MELSEC-Q
4 FUNCTIONS
4.3 Slave Function (I/O Communication Function)
This function allows I/O data communication with the master node, using the buffer
memory of the QJ71DN91.
Communications of 128 input bytes and 128 output bytes are available.
The polling method is used as the connection type.
Programmable controller CPU QJ71DN91
Master node
SET Y11 I/O Communication
Request
Slave
Function
Receive
Data area
0B00
H
0B3F
H
Slave
Function
Transmit
Data area
0C00
H
0C3F
H
Transmit
Receive
X
Y
Slave node
(1) Setting for I/O communication with the master node
(a) Set the number of I/O points in Parameters for Slave Function (address:
060E
H
, 060F
H
) to exchange I/O data with the master node.
This setting is not needed if the default values (8 bytes for each) are used.
(b) Slave function parameters are set in GX Configurator-DN or sequence
programs. (Refer to Section 8.2.)
(2) Reading/writing I/O data
(a) I/O data are stored in the following buffer memory areas.
Buffer memory
address (Hex.)
Item Description
Reference
section
0B00
H
to 0B3F
H
Slave function receive
data
Data received from the master node are stored.
3.4.10
0C00
H
to
0C3F
H
Slave function transmit
data
Data to be sent to the master node are set.
(b) Data transfer between the buffer memory and programmable controller
CPU devices
Transfer method Description
Availability of data
consistency
Reference
section
Auto refresh
Configure the auto refresh settings in GX
Configurator-DN.
Unavailable 8.3.1
MOV or FROM/TO
instruction
Configure the settings in sequence
programs.
Unavailable
8.3.2 Data consistency
dedicated instruction
(DNTSRD, DNTSWR)
Available