Slave Function (I/O Communication Function) - Mitsubishi Electric QJ71DN91 User Manual

4 FUNCTIONS

4.3 Slave Function (I/O Communication Function)

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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.
Master node
Transmit
Receive
(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 , 060F
H
This setting is not needed if the default values (8 bytes for each) are used.
(b) Parameters for slave function are set in the functions for DeviceNet of GX
Works2 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
Item
address (Hex.)
Slave function receive
0B00 to 0B3F
H H
data
0C00 to Slave function transmit
H
0C3F data
H
(b) Data transfer between the buffer memory and programmable controller
CPU devices
Transfer method
Configure the auto refresh settings in the
Auto refresh
functions for DeviceNet of GX Works2.
MOV or FROM/TO
instruction
Configure the settings in sequence
Data consistency
programs.
dedicated instruction
(DNTSRD, DNTSWR)
QJ71DN91
I/O Communication
Request
0B00
H
Function
Receive
Data area
0B3F
H
0C00
H
Function
Transmit
Data area
0C3F
H
) to exchange I/O data with the master node.
H
Data received from the master node are stored.
Data to be sent to the master node are set.
Description
Slave node
Programmable controller CPU
Slave
Slave
Description
Availability of data
consistency
Unavailable
Unavailable
Available
MELSEC-Q
SET Y11
X
Y
Reference
section
3.4.10
Reference
section
8.3.1
8.3.2
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