Omron NX-AD series User Manual

A - 7
Appendices
NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
A-1 Data Sheet
A
A-1-2 Analog Input Units
Unit name Analog Input Unit (current input type) Model NX-AD2204
Number of points 2 points External connection
terminals
Screwless clamping terminal block (8 ter-
minals)
I/O refreshing method Free-Run refreshing
Indicators TS indicator Input method Differential input
Input range 4 to 20 mA
Input conversion range -5 to 105% (full-scale)
Absolute maximum
rating
±30 mA
Input impedance 250 Ω
Resolution 1/8000 (full scale)
Overall
accuracy
25 ° C ±0.2% (full scale)
0 to 55 ° C
±0.4% (full scale)
Conversion time 250 μs/point
Dimensions 12 (W) x 100 (H) x 71 (D) Isolation method Between the input and the NX bus: Power
= Transformer, Signal = Digital isolator (no
isolation between inputs)
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
No supply Current capacity of I/O
power supply terminal
Without I/O power supply terminals
NX Unit power con-
sumption
• Connected to a CPU Unit
1.25 W max.
• Connected to a Communications Cou-
pler Unit
0.90 W max.
Current consumption
from I/O power supply
No consumption
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
Terminal connection
diagram
Input disconnection
detection
Supported
AMP
AG
AG
250 Ω
Input1+ to 2+
Terminal block Input1 − to 2 −
510 KΩ510 KΩ
AG: Analog circuit
internal GND
NX bus
connector
(left)
I/O power supply +
I/O power supply −
I/O power supply +
I/O power supply −
NX bus
connector
(right)
A1 B1
A8 B8
AG
NC
AG
NC
AG terminal is connected to 0 V of analog circuit inside the Unit.
It is not necessary to wire AG terminal normally.
Input +
Input −
Input1+
Current Input Unit
NX-AD2204
Input1−
Input2+
Input2−

Omron NX-AD series Specifications

General

Brand	Omron
Model	NX-AD series
Category	I/O Systems
Language	English