
B-65322EN/02 I/O Link 9.TOTAL CONNECTION DIAGRAM
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9.2.14 Details of Cable K20 (Connection of FANUC I/O Link)
9.2.14.1 Overview
The FANUC I/O Link is a serial interface that connects a CNC, βi
SVM, I/O Unit-A, Power Mate CNC, and other units to transfer I/O
signals (bit data) between these units at high speed. When units are
connected by the FANUC I/O Link, one of the units serves as a master,
and the other units serve as slaves. The status of input signals from
the slaves is transferred to the master at regular intervals, and an
output signal from the master is transferred to the slaves at regular
intervals. The βi SVM can function as a slave only. It has 128
input signals and 128 output signals.
The connectors of the I/O Link are named JD1A (or JD1A1) and
JD1B, which are common to all units having the I/O Link function.
Every cable must be connected from JD1A (or JD1A1) to JD1B.
JD1A of the last unit is connected to nothing, so it is left open. It
need not be connected to a terminator or the like.
Electric cables or optical fiber cables are used for I/O Link connection.
In the following cases, use optical fiber cables:
• The cable length is 10 m or longer. When units are located
within the same cabinet, the cable length is 15 m or longer.
When a cable is installed in a duct, the units connected at both
ends of the cable should be assumed to be within the same
cabinet. For example, suppose that a CNC serving as the host is
placed on the operator's panel, the βi SVM is placed in the power
magnetics cabinet, and the I/O Link cable connecting these units
is passed through a duct. In this case, the CNC and βi SVM are
assumed to be within the same cabinet.
• A cable is routed between different cabinets, and it is impossible
to connect the cabinets with a 5.5-mm
2
or thicker ground cable.
• There is a possibility that a cable is affected by noise
significantly. For example, there is a strong electromagnetic
noise source such as a welding machine near the cable, or a cable
generating noise such as a power cable or a power magnetics
cable is laid in parallel to the cable over a long distance.