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AXDIO128: Discrete I/O

The Discrete I/O Module reads 12 discrete inputs and sets 8 Form C relay outputs while networking with other CAN devices (SAE J1939) in a machine control system. The unit is a battery powered device with the ability to withstand engine cranking, reverse polarity and transient power conditions. In engine applications, information is provided to the engine control system using single-frame J1939 application-specific PDU2 type messages. Outputs can be controlled by any input or CAN message. A bi-color LED indicates operational status.

The AXDIO128 has a number of setpoints that allow the user to configure it for their application. The Windows-based Electronic Assistant can be used to configure the module over the CAN line. The setpoints can also be saved to a file and flashed into other AXDIO128 modules over the CAN bus. Alternatively, a RS-232 interface allows for quick user configuration adjustments using Windows HyperTerminal or other similar terminal software. Settings are saved to non-volatile memory upon command. A CANopen® model is available.

The AXDIO128 features rugged packaging and watertight Deutsch IPD connectors for an IP65 rating. The module is UL recognized for UL508 (FTPM2) – Controls for Stationary Engine Driven Assemblies and has a cUL recognition as well. The control carries a CE mark for the EMC and RoHS Directives. The DIO Module meets the environmental, EMC and vibration requirements of generator set applications in marine installations and has type approvals from several marine societies (LR, DNV-GL, ABS, RINA, RS, CCS, and BV).

Model AX031800 is a new alternative to AXDIO128 or AXDIO128-03 and AX031850 features the same functionality in a compact enclosure.


  • Power Generator Sets
  • Diesel Engine Control Systems
Technical Specifications:Discrete I/O
Order Code:P/N: AXDIO128-03
P/N: AX031800
P/N: AX031850
Power:12V or 24VDC nominal
9…32 VDC power supply range
Inputs:Reads twelve (12) discrete inputs (active low with pull-up resistors)
o Low-Level input voltage: 0 to 0.8 V
o High-Level input voltage: 3.75 to +BAT
o Inputs have internal pull-up resistors
o Input resistance: more than 5 kOhms
o The inputs have internal over and under voltage protection.
Outputs: Sets 8 Form C relay outputs
Resistive load:
o 2A NO)/2 A (NC) at 277 VAC
o 2 A (NO)/2 A (NC) at 125 VAC
o 2 A (NO)/2 A (NC) at 30 VDC
Control logic:The AXDIO128 is designed to work either as a stand-alone module, or on a J1939 CAN network. When connected to the network, it automatically recognizes network connection, claims a network address and can be configured to perform application tasks.
User programmable functionality using Electronic Assistant®
Communications:1 CAN 2.0B port, protocol SAE J1939 at 250 kbps
(For 500 kbps, select models AX031800-01 or AX031850-01.)
(For 1 Mbps, select models AX031800-02 or AX031850-02.)
Enclosure:Rugged aluminum housing, stainless steel end plates, neoprene gaskets
145.30 x 149.00 x 73.00 mm (5.72 x 5.86 x 2.87 inches) L x W x H (models AXDIO128, AXDIO128-03, AX031800)

Compact enclosure (model AX031850)
Protection Rating:IP67, Pollution Degree 3 rating per UL508
Compliance:o UL508 (April 2010) (FTPM2) – Controls for Stationary Engine Driven Assemblies and cUL C22.2 No. 14-10 (2010)
o CE marking for EMC and RoHS Directives
o Marine Type Approvals
Operating Conditions:-40 to 85ºC (-40 to 185ºF)
PDF Datasheet: Click icon for PDF datasheet for model AXDIO128-03.
Click icon for PDF datasheet for model AX031800.

Click icon for PDF datasheet for model AX031850.

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