YOKOGAWA FA Link H2, User Manual

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4-1
IM 34M06H43-02E 2nd Edition : Sep.30, 2019-00
4. Operation and Processing Time
The following section describes sending and receiving of link data and its
processing time in the FA-M3 FA Link system.
4.1 Overview of Data Link Processing
In the FA Link, each station and link device data are linked by the link device
allocated by the FA Link configuration. The following description outlines the
processing starting from the writing of the link device allocated to a local
station until the same data is read by a remote station.
Two processes are involved until the local station data is read in the remote
station, namely, link refreshing and cyclic transmission.
FA-M3
Local station
FA-M3
CPU
module
FA Link
module
FA Link
module
CPU
module
Link
refresh
Cyclic transmission
Link
refresh
S
e
q
u
e
n
ce
p
ro
g
ra
m
remote station
L
in
k
d
a
ta
s
to
ra
g
e
a
re
a
L
in
k
d
a
ta
L
in
k
d
a
ta
L
in
k
d
a
ta
s
to
ra
g
e
a
re
a
S
e
q
u
e
n
ce
p
ro
g
ra
m
Figure4.1.1 Overview of Data Link Processing