Key Features:

These EtherStax I/O units provide a rugged, highdensity, and high-speed solution to interface a large quantity of analog input signals. Units accept 16 single-ended analog voltage inputs and 16 single-ended current inputs. A DB25 port supports an alternate interface of voltage inputs from 8B signal conditioning modules. This combination of high-density analog current and voltage inputs is ideal for many sensor interface applications in remote zones.

• 32-channel high-density combination of analog current and voltage inputs
• DB25 port for alternate voltage inputs from 8B signal conditioning backpanels
• 3-way isolation and surge suppression
• High-resolution 16-bit A/D
• High-speed scanning for 10 millisecond update of all 32 channels
• Automatic zero/span calibration
• On-demand self-test verifies calibration
• Web browser configuration
• 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
• Peer-to-peer i2o communication with percent-of-span and timed updates
• Operating temperature: -40 to 70°C (-40 to 158°F)

Product Details

Analog Field Inputs

Input Channel Configuration

16 single-ended analog voltage inputs and  16 single-ended analog current inputs.

Input Ranges (select on per-channel basis)

±5V, ±10V, ±20mA, 0-20mA, or 4-20mA DC.

Input Scaling (per-channel basis)

Floating Point Format: IEEE-754.

Input Resolution

16-bit maximum, 0.00166% (1 part in 60,000).

Input Accuracy

Current Input: Better than 0.1% of range.

Voltage Input: Better than 0.05% of range.

Input Impedance

Voltage: 4M ohms minimum.

Current: 100 ohms.

Input Scan Groups and Scan Times

Eight user-enabled 4-channel scan groups. 770µS

update/group (5mS for all 32 channels) with averaging, loopback, and totalization functions disabled.

Input Overvoltage Protection

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

Noise Rejection

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

Sample Averaging (user-configurable)

0-500 samples. One register for all channels.

Local Alarm Output


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


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


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. User-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 with SC connector. 2km communication distance. Full/half-duplex, selectable.


Modbus TCP/IP, UDP/IP, i2o peer-to-peer.


StaticIP, DHCP, BootP.

Ethernet Modbus TCP/IP Sockets/Sessions

1-10 socket/sessions user-configurable.

Ethernet Redundancy

Compatible with STP, RSTP, or any ring scheme.


Operating and Storage Temperature

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

Storage: -40 to 85°C (-40 to 185°F).

Power Requirements

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

4.8W (copper ports), 5.8W (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 (150V AC ch-ch).

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).