ML-OI-AX-DI – Option board

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Option board to add four more digital inputs/counters

The ML-417 data logger is standard provided with 3 digital inputs, but some applications might require some more.

The ML-OI-AX-DI option board adds four more digital inputs that can be used to monitor on/off states and/or totalize pulse counts up to 500Hz.

A little coin cell battery makes sure that counter values are kept in case of power outage to the board. The totalizers can manually be set to 0 or any other value through the terminal interface of the ML-417.

Note: To record pulse rates (e.g. a wind speed), on-time or trigger actions, please use the digital inputs of the ML-417 instead.



  • Input voltage: 0..5V
  • Number of inputs: 4
  • Number of totalizers: 4
  • Max. frequency: 500Hz
  • Data type: IEEE-754 floating-point
  • Max. exact totalizer: 16777216
  • 10uA quiescent current

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