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

6. CONNECTION OF I/O UNITS TO
MACHINE INTERFACE
B–62753EN/01
132
The I/O card has a non–insulated interface with terminals that can be
switched between a sink (24V common) and source (0 V common). The
relevant safety standard, however, requires their use as a sink.
Capacity: 30 VDC, 16 mA or greater
Leakage current between contacts of open circuit:
1 mA or less (at 26.4 V)
Voltage drop between contacts of closed circuit:
2 V or less (including voltage drop in cables)
3.3K
Connection as sink: Complies
with CE Marking.
(24 V common)
Contacts
Input signal
COMn
+24E
0V
+24E
Filter and level
converter
Connection as source
(0 V common)
I/O card
Open : Logical 0
Close : Logical 1
Input signal
COMn
+24E
0V
Open : Logical 1
Closed : Logical 0
+24E
3.3K
Filter and level
converter
Caution
When a 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 X1008.0 to X1008.7 must be connected in a
sink layout, because these signals include the emergency
stop signal.
6.8.1
Input Signal
Specifications

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