Omron NX-ID - Page 300

Appendices
A - 50
NX-series Digital I/O Unit User’s Manual (W521)
Unit name Transistor Output Unit Model NX-OD3257
Number of points 4 points External connection
terminals
Screwless clamping terminal block (12 ter-
minals)
I/O refreshing method Switching Synchronous I/O refreshing and Free-Run refreshing
Indicators TS indicator, output indicator Internal I/O common PNP
Rated voltage 24 VDC
Operating load voltage
range
15 to 28.8 VDC
Maximum value of load
current
0.5 A/point, 2 A/Unit
Maximum inrush cur-
rent
4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response time 300 ns max./300 ns max.
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 : 0.5 A/terminal max., IOG : 0.5 A/termi-
nal max.
NX Unit power con-
sumption
• Connected to a CPU Unit
0.85 W max.
• Connected to a Communications Cou-
pler Unit
0.50 W max.
Current consumption
from I/O power supply
40 mA max.
Weight 70 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
Short-circuit
protection
OUT0 to OUT3
This Unit uses a push-pull output circuit.
IOV0 to 3
IOG0 to 3
Terminal block
Internal circuits
Isolation circuit
Drive circuit
NX bus
connector
(left)
I/O power supply +
I/O power supply −
I/O power supply +
I/O power supply −
NX bus
connector
(right)