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3 Part Names and Functions
NX-series Safety Control Unit User’s Manual (Z930)
3-3 Safety I/O Functions
3
3-3-1 Safety Input Functions
Precautions for Correct Use
• The maximum number of connections per Unit is as follows:
NX-SIH400: 20 (10 connected in series × 2 series)
• You can connect up to 10 Non-contact Door Switches to each test output terminal.
• You cannot branch the connections to more than one Non-contact Door Switch from the
same test output terminal.
• The total wiring length (L1 + L2 +…+ Ln+2 in the figure above) for the D40A or D40Z
Non-contact Switches is 100 m max.
• The D40A Non-contact Door Switch can be used in a Safety Category 3 or lower or a PLd or
lower application. It cannot be used in a Safety Category 4 or PLe application.
• The D40Z Non-contact Door Switch can be used in a Safety Category 4 or lower or a Ple or
lower application.
Non-contact Door Switches
24 VDC
0 V
White
Black
Blue
Brown
White
Black
Blue
Brown
Additional I/O Power Supply Unit
NX bus connection
IOV IOV
IOG IOG
T0
Si0
Si1
Si3
Si2
NX-SI
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