A - 13
Appendices
NX-series Digital I/O Unit User’s Manual (W521)
A-1 Data Sheet
A
A-1-2 Digital Input Units
Unit name
DC Input Unit
Model
NX-ID3344
Number of points
4 points
External connection
terminals
Screwless clamping terminal block (12 ter-
minals)
I/O refreshing method
Input refreshing with input changed time
Indicators
TS indicator, input indicators
Internal I/O common
NPN
Rated input voltage
24 VDC (15 to 28.8 VDC)
Input current
3.5 mA typical (at 24 VDC), rated current
ON voltage/ON current
15 VDC min./3 mA min. (between IOV and
each signal)
OFF voltage/OFF cur-
rent
5 VDC max./1 mA max. (between IOV and
each signal)
ON/OFF response time
100 ns max./100 ns max.
Input filter time
No filter
Dimensions
12 (W) x 100 (H) x 71 (D)
Isolation method
Digital isolator 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 the NX bus
Current capacity of I/O
power supply terminal
IOV: 0.1 A/terminal max., IOG
:
0.1 A/termi-
nal max.
NX Unit power con-
sumption
• Connected to a CPU Unit
0.90 W max.
• Connected to a Communications Cou-
pler Unit
0.50 W max.
Current consumption
from I/O power supply
30 mA max.
Weight
65 g max.
Circuit layout
Installation orienta-
tion and restrictions
Installation orientation:
• Connected to a CPU Unit
Possible in upright installation.
• Connected to a Communications Coupler Unit
Possible in 6 orientations.
Restrictions: No restrictions
Terminal connection
diagram
Disconnec-
tion/Short-circuit
detection
Not supported. Protective function Not supported.
IOV0 to 3
IN0 to IN3
IOG0 to 3
Terminal block
Internal circuits
Isolation circuit
Current control
circuit
Power
supply
NX bus
connector
(left)
I/O power supply +
I/O power supply −
I/O power supply +
I/O power supply −
NX bus
connector
(right)
Two-wire
sensor
Three-wire
sensor
24 VDC
Additional I/O
Power Supply Unit
DC Input Unit
NX-ID3344
IOV
IOG
IOV
IOG
IOV
IOG
IOV
IOG
IN0
IOG0
IOV2
IOV0
A1 B1
A8 B8
IN2
IOG3
IN1
IOG1
IOV3
IOV1
IN3
IOG3
A1 B1
A8 B8
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