Datasheet

NX series I/O 25
Analog I/O unit
Current input unit
Item Specifications
Model NX-AD2203 NX-AD3203 NX-AD4203 NX-AD2204 NX-AD3204 NX-AD4204 NX-AD2208 NX-AD3208 NX-AD4208
Name Current input unit
Input range 4 to 20 mA
Input method Single-ended input Differential input
Capacity 2 points 4 points 8 points 2 points 4 points 8 points 2 points 4 points 8 points
Input conversion range –5% to 105% (full scale)
Absolute maximum
rating
±30 mA
Input impedance 250 min. 250 min. 85 min. 250 min. 250 min. 85 min. 250 min. 250 min. 85 min.
Resolution 1/8,000 (full scale) 1/30,000 (full scale)
Overall
accuracy
25°C ±0.2% (full scale) ±0.1% (full scale)
0 to 55°C ±0.4% (full scale) ±0.2% (full scale)
Conversion time 250 s/point 10 s/point
Dielectric strength 510 VAC between isolated circuits for 1 minute at a leakage current of 5 mA max.
Insulation resistance 20 M min. between isolated circuits (at 100 VDC)
Isolation method Between the input and the NX bus: Power = Transformer, Signal = Digital isolator (no isolation between inputs)
Unit power consumption 0.90 W max. 0.90 W max. 1.05 W max. 0.90 W max. 0.90 W max. 1.05 W max. 0.90 W max. 0.95 W max. 1.10 W max.
I/O power supply method Supply from the NX bus No supply
I/O current consumption No consumption
Current capacity of I/O
power supply terminal
0.1 A/terminal max. Without I/O power supply terminals
I/O refreshing method Free-run refreshing Switching synchronous I/O refreshing and
free-run refreshing
Terminal block type Screwless
push-in termi-
nal
8 terminals
(A + B)
Screwless
push-in termi-
nal
12 terminals
(A + B)
Screwless
push-in termi-
nal
16 terminals
(A + B)
Screwless
push-in termi-
nal
8 terminals
(A + B)
Screwless
push-in termi-
nal
12 terminals
(A + B)
Screwless
push-in termi-
nal
16 terminals
(A + B)
Screwless
push-in termi-
nal
8 terminals
(A + B)
Screwless
push-in termi-
nal
12 terminals
(A + B)
Screwless
push-in termi-
nal
16 terminals
(A + B)
Dimensions (W x H x D) 12 × 100 × 71 mm
Weight 70 g max.
Input disconnection
detection
Supported
IOV
IOG
IOV
IOG
IOV
IOG
IOV
IOG
A1 B1
A8 B8
A1 B1
A8 B8
IOV
IOG
NC
IOV
IOG
NC
Input +
24 V (Sensor power supply +)
0 V (Sensor power supply

Input

)
Three-wire sensor
Input1+
Input2+
The NC terminal is not connected to the internal circuit.
24 VDC
NX-AD3203
Input +
24 V (Sensor power supply +)
0 V (Sensor power supply
Input )
Three-wire sensor
IOV
IOG
IOV
IOG
IOV
IOG
IOV
IOG
IOG
IOV
IOV
A1 B1
A8 B8
IOG
IOG
IOV
IOV
IOG
A1 B1
A8 B8
Input1+ Input2+
Input3+ Input4+
24 VDC
NX-AD4203
Input +
24 V (Sensor power supply +)
0 V (Sensor power supply

Input

)
Three-wire Sensor
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOV
A1 B1
A8 B8
IOV
IOV
IOV
IOV
IOV IOV
IOV
IOV
IOG
IOV
IOG
IOV
IOG
IOV
IOG
24 VDC
A1 B1
A8
B8
A1 B1
A8 B8
Input1+
Input2+
Input3+ Input4+
Input7+ Input8+
Input5+ Input6+
Terminal wiring
NX-AD2203
Circuit layout
NX-AD2203
AMP
IOV
IOG
AG
250 Ω
Input1+ to 2+
Terminal block
I/O power supply +
I/O power supply 
I/O power supply +
I/O power supply 
AG: Analog circuit internal GND
AG
AMP
IOV
IOG
Input1+ to 4+Terminal block
I/O power supply +
I/O power supply 
I/O power supply +
I/O power supply 
250 Ω
AG: Analog circuit internal GND
NX-AD3203
NX-AD4203
IOV
AMP
AG AG
Input1+ to 8+
Terminal block
I/O power supply +
I/O power supply 
I/O power supply +
I/O power supply 
85 Ω
AG: Analog circuit internal GND
NX bus
connector
(left)
NX bus
connector
(right)
NX bus
connector
(left)
NX bus
connector
(right)
NX bus
connector
(left)
NX bus
connector
(right)
Additional I/O
power supply unit
Current input unit
NX-AD2203
Additional I/O
power supply unit
Current input unit
NX-AD3203
Additional I/O
power supply unit
I/O power supply
connection unit
Current input unit
NX-AD4203