
9.FANUC I/O Link CONNECTION (FOR I/O Link INTERFACE ONLY) CONNECTION B-65232EN/03
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9.1 OVERVIEW
The FANUC I/O Link is a serial interface for connecting a CNC, β
series servo amplifier (with the I/O Link option), I/O Unit-A, Power
Mate, and so forth to transfer I/O signals (bit data) at high-speed
among those units. When multiple units are connected by using the
FANUC I/O Link, one unit functions as a master, and the other units
function as slaves. The states of input signals from the slaves are
transferred to the master at regular intervals, and an output signal
from the master is transferred to the slaves at regular intervals. The β
series servo amplifier (with the I/O Link option) can function only as
a slave. The number of input points is 128, and the number of output
points is also 128.
The connector names of the I/O Link are JD1A (or JD1A1) and JD1B,
which are common to all units with the I/O Link function. A cable
must always be connected from JD1A (or JD1A1) to JD1B. No cable
is connected to JD1A of the last unit, so that JD1A of the last unit is
left open, and need not have a component such as a terminator
connected.
An I/O Link connection may be made via an electric cable or optical
cable. Use an optical cable in the following cases:
- When the cable is longer than 10 m, or when the cable within the
same cabinet is longer than 15 m. If the cable is installed in a
duct, the units connected to both ends of the cable must be
regarded as being installed within the same cabinet. Suppose, for
example, that a CNC functioning as the host is installed in the
operator's panel, a β series servo amplifier (with the I/O Link
option) is installed in the power magnetics cabinet, and an I/O
Link cable for connecting the CNC with the β series servo
amplifier is run through a duct. In this case, the CNC and the β
series servo amplifier (with the I/O Link option) are regarded as
being installed within the same cabinet.
- When the cable is run from one cabinet to another, and the
cabinets cannot be connected with each other via a ground wire
of 5.5 mm
2
or more
- When the cable is affected significantly by noise. For example,
when a powerful electromagnetic noise source such as a welding
machine is placed near the cable, or when the cable is routed for
a long distance in parallel with a power line or cable related to
power magnetics that generates noise