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1.1 Features
1
OVERVIEW
(c) Link refresh of link data
The method of link refresh for a Q series local station and the master station is
different from that of link refresh for an A/QnA series local station.
1) Q series local station
Refresh is performed in the sequence program.
CHAPTER 7 PROGRAMMING
2) Master station and A/QnA series local station
The data is refreshed automatically at either of the following timing.
• Upon completion of link scan
• Only after execution of the END instruction in the sequence program
For the AnUCPU, QnACPU, A2US(H)CPU(S1) and Q2AS(H)CPU(S1), refresh
ranges can be changed with refresh parameters.
Figure 1.4 Link refresh of link data (Q series local station)
Figure 1.5 Link refresh of link data (Master station and A/QnA series local station)
Q series local station
Local module CPU module
Link data
storage area
Buffer memory
Buffer memory
Data memory
storage area
Link scan
Link refresh
Data flow
(Send/receive processing)
40
0
H
4FF
H
500
H
5FF
H
Receive
processing
DMOV Z0
BMOV W0Z0 Z1
Send
processing
W0 to WFF
W100 to W1FF
"A part" of the program for refresh
U0\
G4
U0\
G1024Z0
DMOV Z0
U0\
G2
BMOV W0Z0 Z1
U0\
G1024Z0
W0 to WFF
W100 to W1FF
Master station and local station for A/QnA series
Link module CPU module
Link data
storage area
Data memory
storage area
Link scan
Link refresh
Data flow
(Send/receive processing)
W0 to WFF
W100 to W1FF
W0 to WFF
W100 to W1FF