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4 FUNCTIONS
4 FUNCTIONS
4.1 Master Function (I/O Communication Function)
Programmable controller CPU
4
4 - 1
This chapter explains the functions of the QJ71DN91.
This function allows I/O data communication with respective slave nodes (up to 63
nodes), using the buffer memory of the QJ71DN91.
Communications of 512 bytes of inputs (up to 256 bytes per node) and 512 bytes of
outputs (up to 256 bytes per node) are available.
Master node
I/O Communication
SET Y11
Request
0700
X
07FF
0900
Y
09FF
(1) Setting for I/O communication with each slave node
(a)
Set the information such as connection types or I/O points in Parameters
for Master Function (address: 01D4
each slave node.
(b)
Parameters for master function are set in GX Configurator-DN or sequence
programs. (Refer to Section 7.3.)
(2) Reading/writing I/O data
(a)
I/O data are stored in the following buffer memory areas.
Buffer memory
Item
address (Hex.)
Master function
0700
to 07FF
H
H
receive data
Master function
0900
to 09FF
H
H
transmit data
(b)
Data transfer between the buffer memory and programmable controller
CPU devices
Transfer method
Auto refresh
Configure the auto refresh settings in GX Configurator-DN.
MOV or FROM/TO instruction Configure the settings in sequence programs.
QJ71DN91
H
MasterFunction
Receive Data
area
H
H
Master Function
Transmit Data
area
H
to 03CF
H
Description
Data received from each slave node are stored.
Data to be sent to each slave node are set.
Description
MELSEC-Q
Slave node
Transmit
Receive
) to exchange I/O data with
H
Reference
section
3.4.6
Reference
section
7.4.1
7.4.2
4 - 1
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