Item Specification
I/O refreshing method Free-Run refreshing
External connection ter-
minals
Screwless clamping terminal block (8 terminals)
Indicators [TS] indicator, [FS] indicator, [OUT] indicator, [OUT ERR] indicator
[OUT] indicator
[OUT ERR] indicator
Safety output ON residual
voltage
1.2 V max. (between IOV and all output terminals)
Safety output OFF residu-
al voltage
2 V max. (between IOG and all output terminals)
Safety output leakage cur-
rent
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
IOG (A3 and B3): 2 A/terminal max.
IOG (A7 and B7): 0.5 A/terminal max.
NX Unit power consump-
tion
• Connected to a CPU UNIT or a Communication Control Unit
1.10 W max.
• Connected to a Communications Coupler Unit
0.75 W max.
Current consumption
from I/O power supply
60 mA max.
Weight 65 g max.
Circuit layout
Internal Circuits
So0
–
3
Terminal block
IOG
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 - 34
NX-series Safety Control Unit User's Manual (Z930)
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