Item Specification
I/O refreshing method Free-Run refreshing
External connection terminals Screwless clamping terminal block (8 terminals)
Indicators [TS] indicator, [FS] indicator, [IN] indicator, [IN ERR] indicator
[IN] indicator
[I
N ERR] indicator
Safety input current 4.5 mA typical
Safety input ON voltage 11 VDC min.
Safety input OFF voltage/OFF
current
5 VDC max./1 mA max.
Test output type Sourcing outputs (PNP)
Test output rated current 25 mA max.
Test output ON residual voltage 1.2 V max. (IOV and all output terminals)
Test output leakage current 0.1 mA max.
Dimensions (mm) 12 × 100 × 71 (W × H × D)
Isolation method Photocoupler isolation
Insulation resistance 20 MΩ min. between isolated circuits (at 100 VDC)
Dielectric strength 510 VAC between isolated circuits for 1 minute at a leakage current of 5
mA max.
I/O power supply method Power supplied from the NX bus
Current capacity of I/O power
supply terminals
No applicable terminals.
NX Unit power consumption
• Connected to a CPU Unit or a Communication Control Unit
1.10 W max.
• Connected to a Communications Coupler Unit
0.70 W max.
Current consumption from I/O
power supply
20 mA max.
Weight 70 g max.
Circuit layout
Internal Circuits
T0 – 1
Terminal block
Si0 – 3
I/O power supply +
I/O power supply -
NX bus
connector
(left)
I/O power supply +
I/O power supply -
NX bus
connector
(right)
2 Specifications
2 - 19
NX-series Safety Control Unit User's Manual (Z930)
2-2 Safety Input Unit
2
2-2-1 Models and Specifications
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