
1.I/O LINK-II I/O FUNCTION SPECIFICATIONS B-62714EN/04
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1.3 SLAVE FUNCTION
The slave function consists of the following functions:
(1) DI/DO data transfer function
(2) Global I/O transfer function (FANUC unique function)
(3) Capability of turning on and off the power to a slave station at
any time without affecting communications performed by other
devices
NOTE
FANUC I/O Link-II (slave function) uses the following
services of OPCN-1:
(1) Initialization service
(2) Input/output service
(3) Reset service
About the global I/O transfer function:
The figure below shows DI/DO data transfer performed between a
master station and slave stations #1 to #N. Suppose that a slave
station using the global I/O transfer function is a local slave station,
and the other slave stations are remote slave stations. Then, the local
slave station (#2) can receive DO data sent from the master station
and can also receive DO data sent to the master station from the
remote slave stations. So, the local slave station can make a ladder
reference.
Master
station
Slave station #1
[Remote slave
station]
Slave station #2
[Local slave
station]
Slave station #3
[Remote slave
station]
Slave station #N
[Remote slave
station]
DO data from slave stations #1 to #N (excluding #2)
NOTE
The global I/O transfer function is not a function
defined by OPCN-1 but a FANUC unique function.
This function can be used even when the network
includes products of other manufacturers (even as a
master station). In this case, however, the size of
data that can be transferred is limited.