FANUC Series 16/18/160/180-Model C Connection Manual (Hardware)

6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
B–62753EN/01
110
Caution
When a 0V common (source) interface is used, a ground
fault in an input signal has the same effect as closing the
contacts. From the viewpoint of safety, therefore, FANUC
does not recommend the use of such an interface for input
signals. In particular, input signals X008.0 to X008.7 must
be connected in a sink layout, because these signals
include the emergency stop signal.
Output signals DO00 to DO77 of the operators panel connection unit
drive indicators and LEDs on the machine operators panel and use NPN
transistor for drivers.
Prepare 24VDC for power supply of indicators and LEDs and connect 0V
to COM3 and COM4. For LEDs, however, 5VDC 300mA output from
the terminal +5N of the connector CM3 can be used. There is no +5N in
the connector CM4; use +5N in connector CM3 as shown below:
Output regulation Load voltage :24V +20% or less
Load current : 40mA
Transistor output
Connector CM3 Indicator
Connector CM4 Indicator
+5VDC
300mA
max
DO00 to 57
Operator’s panel
connectIon unit
R
+5N
COM3
LED
COM4
DO60 to 77
+
Transistor output
R
R
LED
R
24V
stabilized
power
Caution
When a sink output interface is used, a ground fault in an
output signal causes the output signal to remain on. From
the viewpoint of safety, therefore, FANUC does not
recommend the use of such an interface for output signals.
6.5.2
Output Signal
Regulations for
Operators Panel
Connection Unit

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