Appendices
A - 26
NX-series Digital I/O Unit User’s Manual (W521)
DC Input Units (M3 Screw Terminal Block, 30 mm Width)
Unit name
DC Input Unit
Model
NX-ID5142-1
Number of points
16 points
External connection
terminals
M3 screw terminal block (18 terminals)
I/O refreshing method
Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators
TS indicator, input indicators
Internal I/O common
For both NPN/PNP
Rated input voltage
24 VDC (15 to 28.8 VDC)
Input current
7 mA typical (at 24 VDC)
ON voltage/ON current
15 VDC min./3 mA min. (between COM and
each signal)
OFF voltage/OFF cur-
rent
5 VDC max./1 mA max. (between COM and
each signal)
ON/OFF response time
20 μs max./400 μs max.
Input filter time
No filter, 0.25 ms, 0.5 ms, 1 ms (default), 2
ms, 4 ms, 8 ms, 16 ms, 32 ms, 64 ms, 128
ms, 256 ms
Dimensions
30 (W) x 100 (H) x 71 (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
Supply from external source
Current capacity of I/O
power supply terminal
Without I/O power supply terminals
NX Unit power con-
sumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communications Cou-
pler Unit
0.55 W max.
Current consumption
from I/O power supply
No consumption
Weight
125 g max.
Circuit layout
IN0
to
IN15
COM
COM
Internal circuits
Terminal block
Input indicator
3.3 kΩ
I/O power
supply +
NX bus
connector
(left)
NX bus
connector
(right)
I/O power
supply −
I/O power
supply +
I/O power
supply −
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