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M66 - Mezzanine Card with 32 Digital Inputs/Outputs


The M66 is an M-Module with 32 inputs or 32 outputs or mixed I/O in groups of 4. It is designed for industrial automation, medical computers, in-vehicle computers, and embedded computers in transportation.

  • M66 Product ImageM66 32 Digital Inputs/Outputs
  • M66 Product Image

Main Features

  • 32 inputs 0 V to 32 V or
  • 32 outputs 12 V to 32 V or
  • Mixed I/O in groups of 4
  • 1.9 A output current per channel
  • 16 A switching power on one M66
  • Load on ground
  • Optical isolation
  • -40 °C to +85 °C versions
M66 Product Image

Technical Data

Binary I/Os
  • 32 binary signals
    • 4 optically isolated units
    • 8 channels for each unit
  • Individual use of each channel as input or output
  • Individual edge-triggered interrupts
  • Input/output load on ground
  • High-side output switches
  • High output current
    • Max. 1.9A per channel
    • Max. 4A per unit
  • Over-current and over-temperature protection
Output Characteristics
  • Output voltage range: 12V..32V
  • Output current log. 0: max. 10µA
  • Output current log. 1: max. 1.9A
  • Switching time for output change: 200µs typ.
  • Isolation voltage (optocoupler): 500V DC
Input Characteristics
  • Input voltage min.: 0V
  • Input voltage max. external supply voltage (12..32V)
  • Voltage level log. 0: 0V..6V or open
  • Voltage level log. 1: 12V..32V
  • Input current log. 1: 4.4mA @ 24V
  • Switching threshold: 9.2V @ 0.78mA typ.
  • Switching time for input change: 200µs typ.
  • Excess voltage protection: ± 50V
Peripheral Connections
Via front panel on a shielded 44-pin HD-Sub receptacle connector
M-Module Characteristics
Electrical Specifications
  • Isolation voltage:
    • 500V DC between isolated side and digital side
    • 180V DC between the channels
    • Voltage between the connector shield and isolated ground is limited to 180V using a varistor; AC coupling between connector shield and isolated ground through 47nF capacitor
  • Supply voltage/power consumption:
    • +5V (4.85V..5.25V), 200mA typ.
    • +24V (external supply voltage 12..32V), 46mA typ.
  • MTBF: 45,000h @ 50°C (derived from MIL-HDBK-217F)
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 110g
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C or -40..+70°C
    • -40..+85°C with an airflow of 1.0 m/s
  • Temperature range (storage): -40..+85°C
  • Relative humidity range (operation): max. 95% without condensation
  • Relative humidity range (storage): max. 95% without condensation
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..150Hz
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
Tested according to EN 55022 (radio disturbance), IEC 61000-4-2 (ESD) and IEC 61000-4-4 (burst)
Software Support
  • MEN Driver Interface System (MDIS for Windows, Linux, VxWorks, QNX, OS-9)
  • For more information on supported operating system versions and drivers see Software.


32 in or 32 in/out
Operating Temperature
  • 0..+60°C
  • -40..+70°C
  • -40..+85°C (with an airflow of 1.0 m/s)

Ordering Information

Standard M66 Models

32 digital inputs and/or outputs, 0°C to +60°C


32 digital inputs, 0°C to +60°C


32 digital inputs and/or outputs, -40°C to +85°C screened

Miscellaneous Accessories

M-Module cable, 2m, with 44-pin half-pitch D-Sub plug/housing to 50-pin D-Sub receptacle/housing, (connecting 1:1)


M-Module cable, 2.5m, with 44-pin HD-Sub plug/housing to pig tail


25 mounting screw sets to fix M-Modules on carrier boards (3 different screw types, 50 pieces each)



The MDIS5 system package includes most standard device drivers for Linux available from MEN.


MDIS4/2004 / MDIS5 Windows driver (MEN) for M66, A302 and D302


MDIS5 System (and Device Driver) Package (MEN) for VxWorks. This software package includes most standard device drivers available from MEN.


MDIS4/2004 system (and device driver) package (MEN) for QNX, source code. This software package includes most standard device drivers available from MEN.


MDIS5 low-level driver sources (MEN) for M66, A302 and D302

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