904MB / 905MB / 906MB

Multi-Channel Modbus-RTU Discrete I/O Modules

Product Features

  • Operating temperature: -25°C to +70°C (-13°F to +158°F)
  • Tandem input/output circuitry (906 models only) connects input buffers with open-source outputs for convenient loopback monitoring of the output state
  • Watchdog timers provide a configurable failsafe output state for use when host I/O communication is lost
  • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
  • Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication
  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
  • High-voltage, high-current, open-source outputs enable direct (high-side) control of external devices
  • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices

Product Description

These modules provide twelve discrete input and/or output channels. Isolation separates the I/O, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus RTU protocol. Both AC and DC power sources are supported with wide range, nonpolarized, diode-coupled terminals.


  • Datasheet for 904MB / 905MB / 906MB

Ordering info

Available Models

Model No.Model Description
905MB-0900Modbus RTU Discrete Output Module: 12 output channels
906MB-0900Modbus RTU Discrete Input/Output Module: 12 input/output channels
904MB-0900Modbus RTU Discrete Input Module: 12 input channels
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