Precautions for Correct Use
• The maximum number of connections per Unit is as follows:
NX-SIH400: 5 (5 connected in series × 1 series)
• Y
ou can connect up to five Safety Eddges to the two test output terminals.
• You cannot branch the connections to more than one Safety Edge or Safety Mat from the
same test output terminal.
Blue
BrownBrown
Blue
Blue
BrownBrown
Blue
Si0
Si1
T0
NX-SIH400
T1
Si3
Si2
Safety edge
• Safety Edges can be connected only with two wires on each side (no terminating resistance).
You cannot connect terminating resistance.
•
The total wiring length (L1 + L2 +…+ Ln+1 in the figure above) for the SGE Safety Edges is
100 m max.
• The SGE Safety Edge 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.
Types of Safety Input Functions
The types of safety input functions that are performed by the Safety Input Unit is shown below.
For the safety input functions, the safety signals that are input to the safety input terminals are evaluat-
ed and safety input data that can be used in the safety program is created.
The configuration of the safety input functions is shown in the following figure.
The values that are read from the safety input terminals are passed to the safety program only after
they are evaluated by the safety input functions.
4 Safety Control Unit Operation
4 - 22
NX-series Safety Control Unit User's Manual (Z930)
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