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MELSEC-Q
3 SPECIFICATIONS
(2) Link refresh, link scan, I/O refresh and automatic refresh
Link refresh of the remote master station is done in the END processing of the
CPU module.
Link scan is performed synchronously with the CPU module sequence scan.
The I/O refresh and automatic refresh of the remote I/O station and performed
"asynchronously" with the link scan.
END0
Remote master station
sequence scan
Link scan
END0 END0 END0
Link refresh Link refresh Link refresh
Link refresh Link refresh Link refresh
Remote I/O station
network module
Input/output module
Intelligent function
module
I/O refresh
I/O refresh
Automatic refresh Automatic refresh
I/O refresh
Automatic refresh
(3) Link data when communication error station/communication stop
station has occurred
If a remote I/O station has experienced a communication error or communication
stop, the remote master station saves the immediately preceding data (X,B,W)
from the communication error station and communication stop station.
The remote I/O station output (Y) is set to all points off.
(A communication stop station is a station that has had its cyclic transmission
stopped by peripheral equipment.)
X
Y
B
B
W
W
X
Y
B
B
W
W
Remote master station Remote I/O station
All points off
· · · · Location of stora
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