Filter
Top Products
4
FUNCTIONS
4.1 Cyclic Transmission Function
4.1.2 1 : 1 communication (X/Y communication)
4 - 5
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
PREPARATORY
PROCEDURES BEFORE
OPERATION
6
LINK DATA SEND/
RECEIVE PROCESSING
AND PROCESSING TIME
7
PROGRAMMING
8
TROUBLESHOOTING
4.1.2 1 : 1 communication (X/Y communication)
Using a part of the I/O points assigned to a master station and a local station, one-to-one
data communication is performed between the master and local stations.
The sending and receiving sides are regarded as output (Y) and input (X) respectively.
(1) I/O ranges in X/Y
The I/O ranges of X/Y are set up with link parameters of the master station.
(2) Link refresh of link data
Q series local stations refresh link data using the sequence program. Note that
refresh is not executed when the CPU module is in STOP status.
CHAPTER 7 PROGRAMMING
(3) X/Y communication example
The following illustrates an example where input (X) and output (Y) data are
transferred between the master station and a Q series local station.
Figure 4.7 X/Y communication data flow
Figure 4.8 X/Y communication example
X
Y
X
Y
Y
X
Y
X
Data memory
storage area
Q series local station
Local module
CPU module
Master station
Link data
storage area
Link data
storage area
Buffer memory
Buffer memory
Data memory
storage area
Link scan
Link refresh
Data flow (Send/receive processing)
Actual I/O
Actual I/O
CPU module
Link
module
0
47F
400
Y400
Output
instruction
CPU module
Local module
buffer memory
Y480
Output
instruction
X480
Link refresh
Cyclic transmission
XY XY
0
400
Actual I/O
Actual I/O
XY
47F197
H
190H
480
4FF
218H
21FH
X400
480
4FF
Program for refresh
Program for data link
END processing
Program for data link
END processing
Master station Q series local station