Key Features:

• 96 discrete I/O channels: Bi-directional channels support any input/output mix in a single unit.
• High-density stackable unit: Stacked mounting puts a lot of I/O in a very small footprint to save panel space.
• High speed channel updates: Updates all 96 channels in 1mS.
• Modbus TCP/IP or UDP/IP protocol: I/O functions as slave to host controller.
• Peer-to-peer i2o communication: Inputs to one unit automatically update outputs on another over Ethernet link.
• Change-of-state or timed updates: Event-driven updates transmit data in less than 5mS between peers with i2o.
• 10 Modbus TCP/IP sockets/sessions: Multiple masters can talk to an EtherStax unit at the same time.
• Self-test checks I/O operation: Test I/O channels from a web browser before wiring terminals to devices.
• Selectable input “wetting” current: Internal current source eliminates pull-ups and improves dry contact interface.
• Automatic change of state detection: Inputs detect quick momentary changes of state that occur between polling.
• Internal or external port excitation: Selectable source on each 16-channel port simplifies wiring and adds flexibility for use with 5-28V DC logic.
• Loop-back monitoring on all channels: Inputs confirm output states for increased system reliability.
• Watchdog timers and failsafe outputs: Communication fault sends output to a pre-defined state or holds the last value.
• Output open-load detection: Output fault detection is selectable on individual channels.
• Thermal, current, voltage protection: I/O is protected from excessive levels to reduce downtime.
• Operating temperature: Open board, -40 to 75°C (-40 to +167°F); Closed board, -40 to 75°C
(all outputs “off”); -40 to 70°C (all outputs “on” at rated Max.).

Product Details


Configuration (active-low inputs)
– 96 channels (six 16-ch ports) with a common return (RTN). Each input is connected in tandem with opendrains of output mosfets. Any mix of I/O occurs as all channels are high impedance inputs unless written.
– Output channels can be read back at any time (loopback monitoring).
Input Signal Voltage Range
– 0 to 28VDC, 31V maximum. Surge protected.
Input Threshold Detection and Sensitivity
– 4V DC threshold. Level or latching inputs.
Input “Wetting” Current
– Built-in current sources switch from 16mA initially (20ms) to 2mA (continuous), default mode.
– Sources can be changed to 2mA or turned off.
– Internal (default): 6V DC, 400mA.
– External: 6 to 28V DC typical.
– Separate excitation terminal (logic) for each 16-channel port.
– Internal and external supplies are diode-blocked from each other.
– Includes reverse polarity protection.
Peer-to-peer (i2o) communication
– Change-of-state updates: Less than 5mS events.
– Timed updates: Configurable for 1-90 seconds.


Configuration (low-side switches)
– 96 channels (six 16-ch ports) of open-drain mosfet switches with common source connection at port RTN terminal. Each output is connected in tandem with buffered inputs.
Output “OFF” Voltage Range
– 0 to 28V DC, 31V maximum. Surge protected.
Output “ON” Current Range
– 0 to 300mA DC continuous, each output.
Output “ON” Maximum Current
– 450mA DC maximum with any 8 channels “on” continuously per 16 channel port.
Output Port Maximum Current
– 4.8A: 16 channels @ 300mA continuous.
– 3.6A: 8 channels “off” & 8 channels @ 450mA.

Local Alarm Output

– Isolated relay de-energizes (failsafe) or energizes (non-failsafe) as configured when the watchdog timer detects a media or communication failure.
– SPST-NO, 1 Form A, Class I, Division II approved.
– 5A @ 24VDC/250VAC, 6000 cycles resistive.
– 3A @ 24VDC/250VAC, 100,000 cycles general.
– 2A @ 24VDC/250V AC, Hazardous locations
Maximum Switching Voltage
250VAC, 125VDC.

Enclosure and Physical

Safety Approvals
– CE marked and UL/cUL Listed.
– Hazardous Locations: Class 1; Div. 2; A B C D.
– Open board units: UL Recognized.
– Shock and Vibration Immunity.
– Rating for single surface-mount unit in enclosure.
– Mechanical Shock: 50g, 3ms, with 3 half-sine shock pulses in each direction along 3 axes
(18 shocks), and 30g, 11ms, with 3 half-sine shock pulses in each direction along 3 axes (18 shocks), per IEC60068-2-27.
– Random Vibration: 5g, 5-500Hz, in 3 axes at 2 hours/axis per IEC60068-2-64.


Operating and Storage Temperature
– Operating: Open bd,-40 to 75°C(-40 to +167°F).
– Enclosed bd, -40 to 75°C (all outputs “off”).
– -40 to 70°C (all outputs “on” at rated Max.).
– Storage: -40 to +85°C (-40 to +185°F).
Power Requirements
– 18-36V DC. Redundant, diode-coupled terminals.
– Dual copper ports: 2.5W with external excitation, 3.5W with internal excitation.
– Fiber optic units: Call factory.
– I/O, power, relay and Ethernet port-to-port.
– Peak: 1500V AC, ANSI/ISA-82.01-1988.
– Continuous: 250V AC, 354V DC.

Ethernet Interface

Internal Switch or Hub/Repeater
– Dual-port Ethernet switch. Web-configurable as a true switch (default mode) or 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.
Protocols and Addressing
– Modbus TCP/IP or UDP/IP. i2o peer-to-peer.
-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.