Key Features:

These EtherStax I/O units provide a rugged, high-density, and high-speed solution to interface a large quantity of analog input signals. Units natively accept 32 differential high-level analog voltage inputs, which are ideal for most sensor interface applications in remote zones.

• 32 differential high-level voltage analog inputs
• Dual DB25 ports for alternate interface to 8B signal conditioning backpanels
• 4-way isolation and surge suppression
• Configurable from any web browser
• High-resolution 16-bit A/D
• Fast scanning up to 1KHz
• Dual-format data registers support both 16-bit signed integers and 32-bit floating point formats
• User-configurable IEEE-754 32-bit floating point scaling registers on all channels
• User-configurable integration function on all channels with totalizing 32-bit non-volatile counter registers
• Built-in precision voltage sources for automatic calibration
• On-demand self-test for built-in calibration sources
• Operating temperature: -40 to 70°C (-40 to 158°F)

Product Details

Analog Field Inputs

Input Channel Configuration

32 differential analog inputs. 16 channels on front and  rear panels of unit.

DC Voltage Input Ranges (per-channel basis)

±5V or ±10V 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 are represented as ±30,000.

Input Resolution and Accuracy

Resolution: 16-bit maximum, 0.00167%.

Accuracy: Better than 0.02% of range.

Input Impedance

Greater than 1M ohms.

Input Scan Groups and Scan Times

Eight user-enabled 4-channel scan groups.

5mS (200Hz) update of all 32 channels.

8mS (125Hz) update when totalizing.

First 4-channel group updates in 770µS (1.3Khz). Each  additional 4-ch. group adds 590µS to update time.

Sample Averaging

0 to 500 samples, user-configurable.

Input Overvoltage Protection

Bipolar Transient Voltage Suppressers (TVS),  18V clamp level typical.

Noise Rejection

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

8B External Inputs

Input Configuration (per-channel basis)

Web page configuration sets channels to sense inputs  via screw terminals or DB25 port.

8B Input Module Outputs

All 8B input modules provide 0-5V, 1-5V or ±5V DC  outputs.

8B Input Module Power

8Bs require 5V DC ±5%. For other power options,  order one (1) supply per backpanel.

7-34V DC: Model 8BPWR-2 power supply.

AC power: Model PS5R-B05 or PWR-4505.

8B Input Isolation (CMV Input-to-Output)

1500Vrms channel-to-channel isolation.

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-T(X)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. 2km communication distance. Full/half-duplex, selectable.

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 Ranges:

-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).


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; Div 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).