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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: 12 (12 connected in series × 1 series)
• You can connect up to 12 Safety Mats to the two test output terminals.
• You cannot branch the connections to more than one Safety Mat or Safety Edge from the
same test output terminal.
• The total wiring length (L1 + L2 +…+ Ln+1) for the UM Safety Mats is 100 m max.
• The UM Safety Mat can be used in a Safety Category 3 or lower or a PLd or lower applica-
tion. It cannot be used in a Safety Category 4 or PLe application.
Brown
White
Black
Blue
Brown
Safety Mats
White
Si0
Si1
T0
NX-SIH400
T1
Si3
Si2
Black
Blue
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