Key Features:

These EtherStax I/O modules provide a rugged, high-density, and high-speed solution to interface a large quantity of analog input signals to SCADA and distributed I/O systems. Each unit converts up to 64 single-ended analog current signals from various sensors and instruments for transmission to an Ethernet-based control network. Typical applications include process control, automated manufacturing, remote data acquisition, test and measurement, embedded computing, and supervisory monitoring systems

• 64 single-ended analog current inputs
• 4-way isolation and surge suppression
• High-resolution 16-bit A/D
• High-speed scanning with 10 millisecond update of all 64 channels
• Automatic zero/span calibration
• On-demand self-test verifies calibration
• Configurable from any web browser
• User-configurable sample averaging and integration/totalization function with non-volatile registers
• Dual-format data registers support 16-bit integers or 32-bit floating point
• Scaling registers on all channels
• Operating Temperature: -40 to 70°C (-40 to 158°F)

Product Details

Analog Field Inputs

Input Channel Configuration

64 single-ended analog inputs. 32 channels on front  and rear panels of unit.

DC Current Input Ranges

±20mA, 0-20mA, or 4-20mA DC (default).

User-configured on a per-channel basis.

Input Scaling (per-channel basis)

Floating Point Format: IEEE-754 32-bit configurable for

12 digits with 4 decimal places.

16-bit Signed Integer Format: All channels represented  as ±30,000.

Input Resolution and Accuracy

Resolution: 15-bit maximum, 0.003%.

Accuracy: Better than 0.1% of range.

Input Impedance

100 ohms.

Input Scan Groups and Scan Times

Eight user-enabled 8-channel scan groups.

10mS (100Hz) update of all 64 channels.

First 8-channel group updates in 1.80mS (555Hz).

Each additional 8-channel group adds 1.20mS to the  update time.

Sample Averaging

0 to 500 samples, user-configurable.

Input Overvoltage Protection

Bipolar Transient Voltage Suppressors (TVS),  14V working voltage.

Noise Rejection

Common Mode (50-60Hz): Better than 72dB.

Local Alarm Output


Failsafe or non-failsafe (software-configurable) relay  trips on power or link-loss failure.


SPST-NO, 1 Form A, Class I, Division II approved.


5A @ 24V DC/250V AC, 6000 cycles resistive.

3A @ 24V DC/250V AC, 100,000 cycles general.

2A @ 24V DC/250V AC, Hazardous locations.

Maximum Switching Voltage and Power

250V AC / 750VA, 125V DC / 90W.

Ethernet Interface

Internal Switch or Hub/Repeater

Dual-port Ethernet switch. Web-configurable as a true  switch (default mode) or low-latency hub.

Network Connector (10/100 Base-TX Copper)

One or two 8-pin RJ-45 connectors. Automatic MDI/MDI-X. 100m communication distance.

Network Connector (100 Base-FX Fiber-optic)

One multi-mode duplex SC connector. Full-duplex only.

2km communication distance.

Protocols and Addressing

Modbus TCP/IP or UDP/IP. StaticIP, DHCP, BootP.

Configurable IP addresses.

Ethernet Modbus TCP/IP Sockets/Sessions

1-10 socket/sessions programmable via web page.

Ethernet Redundancy

Compatible with STP, RSTP, proprietary schemes.


Operating and Storage Temperature

Operating Range: -40 to 70°C (-40 to 158°F).

Storage Range: -40 to 85°C (-40 to 185°F).

Power Requirements

18-36V DC. Redundant, diode-coupled terminals.

4.4W (copper ports), 5.5W (fiber-optic ports).

Ambient Temperature Effect

Less than 35ppm/°C (0.0035%/°C).


I/O, power, relay and Ethernet port-to-port.

Peak: 1500V AC, ANSI/ISA-82.01-1988.

Continuous: 250V AC, 354V DC.

Enclosure and Physical

Safety Approvals

CE marked and UL/cUL Listed.

Hazardous Locations: Class I; Division 2; A, B, C, D.

Open board units: UL Recognized.

Shock and Vibration Immunity (in enclosure)

Mechanical Shock: 50g (3ms), 30g (11ms).

Random Vibration: 5g, (5-500Hz).

Ordering Information