6. CONNECTION OF I/O UNITS TO
In the I/O Link there are the master station and its slave stations. The
master is the control unit of the CNC, and the slaves are the I/O unit and
interface unit for the operator’s panel. The slaves are divided into groups,
and up to 16 groups can be connected to one I/O Link. A maximum of
two base I/O unit–MODEL A can be connected as a group. The operator’s
panel connection unit and connection unit are each counted as one group.
The I/O Link is connected in different ways depending on the types of
units actually used and the I/O points. To connect the I/O Link, the
assignment and addresses of the I/O signals have been made
programmable with the PMC program. The maximum number of I/O
points is 1024.
The two connectors of the I/O link are named JD1A and JD1B, and are
common to all units. A cable is always connected from JD1A of a unit
to JD1B of the next unit. Although JD1B of the last unit is not used and
left open, it need not be connected with a terminator.
(A terminator is needed for the last interface module of each group of the
I/O Unit–MODEL A.)
The pin assignments of connectors JD1A and JD1B are common to all
units on the I/O Link, and are illustrated on the next page. Use the figures
when connecting the I/O Link irrespective of the type of unit.
THE FANUC I/O LINK