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M72 - Mezzanine Card with Motion Counter


The M72 is an M-Module with 4 cascadable 32-bit counter units supporting timer, counter and comparator functions. It is designed for industrial automation, medical computers, in-vehicle computers, and embedded computers in transportation.

Download data sheet

  • M72 Product ImageM72 Motion Counter
  • M72 Product Image

Main Features

  • 4 independent cascadable 32-bit counters
  • 2 comparators per counter
  • Quadrature incremental encoder interface
  • Pulse width/frequency measurement
  • Multimode event generation
  • Customized counter modes via FPGA
  • RS422 or TTL or 24V
  • Optical isolation
  • -40 °C to +85 °C versions
M72 Product Image

Technical Data

Four Independent Counters
  • 32-bit up/down counter
  • Two 32-bit comparators
  • One 32-bit preload register
  • Clock frequency 40MHz
Counter Modes
  • Single count
  • 1x quadrature, 2x quadrature, 4x quadrature
  • Frequency measurement
  • Pulse width "high", pulse width "low"
  • Period measurement, timer
  • 3 inputs for each counter
  • RS422, TTL or 24V input
  • Timing characteristics for the different modes:
    • Single count: t high > 200ns; t low > 200ns
    • Quadrature: time between two active edges (t edges > 400ns)
    • Frequency measurement: gating time 10ms, < 2.5MHz
    • Pulse width: t high or t low > 15µs
    • Period: t high or t low > 15µs, internal frequency 2.5MHz
    • Synchronization of input signals with onboard clock (40MHz)
  • Input debouncing time: 100ns
  • RS422 input characteristics: see user manual
  • TTL input characteristics:
    • Uin < 0.5V = "low"
    • Uin > 2.2V = "high"
    • Uin max. = 12V
    • Max. input current: ±5mA
  • 24V input characteristics:
    • Uin < 1V = "low"
    • Uin > 10V = "high"
    • Uin max. = 30V
    • Max. input current: ±10mA
    • Max. frequency measurement: 500kHz
  • 4 TTL outputs (optically isolated)
  • Output current:
    • High current: 10mA
    • Low current: 15mA
Peripheral Connections
Via front panel on a shielded 44-pin HD-Sub receptacle connector
M-Module Characteristics
Electrical Specifications
  • Isolation voltage: 500V DC
  • Supply voltage/power consumption: +5V (4.85V..5.25V), 550mA
  • MTBF: 70,000h @ 50°C (derived from MIL-HDBK-217F)
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 100g
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C
    • Industrial temperature range on request
    • Airflow: min. 10m³/h
  • Temperature range (storage): -40..+85°C
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (storage): max. 95% non-condensing
  • 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.

Ordering Information

Standard M72 Models

4 x 32-bit motion counter, 0..+60°C


4x 32-bit motion counter, -40..+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 M72


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.


MDIS4/2004 / MDIS5 low-level driver sources (MEN) for M72

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