Encoder MEM – BUS EtherCAT

Encoder with EtherCAT interface – UL Listed

Absolute encoders MEM-BUS EtherCAT comply with Profile CANopen over EtherCAT (CoE), Cia DS-406. They avail on EtherCAT conformance certification and are UL Listed for the canadian and US market.

Based upon Ethernet communication protocol, EtherCAT interface is steady, flexible and fast, specially suited to the communication among control systems and peripheral devices, such as I/O systems, drives, sensors and actuators.

EtherCAT operating principle – processing on the fly – enables a Real Time communication between the Master and the Slave devices; it supports any topology – line, bus, tree, star – and a flexible number of nodes.

Reduced cabling and easy configuration – each slave is addressed automatically – simplify the installing operations.

MEM-Bus encoders are supplied in multiturn version with 29 bit resolution (8192 steps/revolution x 65536 revolutions).

Different mechanical versions are available to satisfy all application requirements: square flanged, round flanged with servo coupling, and with hollow shaft to couple directly to a motor shaft; all the types offer different options for the shaft/hole diameter. The electrical connection is by 3 M12 connectors.

The stout aluminium case ensures a high protection degree, so that it is possible to apply MEM-Bus encoders in severe industrial environments.

The innovative electronic construction technology – involving no mechanical gear –allows to reach high acceleration and speed values and grants the transducer long life.



  • Encoder Profile CANopen over EtherCAT (CoE), CIA DS-406
  • Physical Layer: EtherCAT 100Base-TX, Fast Ethernet, ISO/IEC 8802-3
  • Output code: Binary
  • Cycle time ≥ 1 ms
  • Transmission rate 100 Mbit/s
  • Supply 10÷30  Vdc  2.5 W
  • Resolution 29 bit
  • Steps/revolution: 8192/13 bit
  • Revolutions no.: 65536/16 bit
  • Data memory > 20 years*
  • Several configurations available
  • Aluminium case
  • Protection degree: IP67 – Shaft side IP65
  • Electronic reset

*No motion, power off


  • Counting direction
  • Measuring steps per revolution
  • Total measuring length in steps
  • Preset value
  • Speed resolution


4 signalling LEDs for:

  • L/A in
  • L/A out
  • Error
  • Run
  • Series MEM520 - Bus

    Ø 58 mm round flange
    Servo coupling
    Ø 50 mm centering mask
    Ø 6, 8 o 10 mm shaft

  • Series MEM540 - Bus

    Ø 58 mm round flange
    Ø 36 mm centering mask 3
    M4 holes at 120° on Ø 48 mm
    Ø 6, 8 o 10 mm shaft

  • Series MEM440 - Bus

    Hollow shaft for motor mounting
    Ø 8, 10, 12, 14, 15 mm hole

  • Series MEM450 - Bus

    Hollow shaft for motor mounting
    Ø 8, 10, 12, 14, 15 mm hole
    Fixing by elastic support

  • Series MEM620 - Bus

    63.5×63.5 mm square flange
    Ø 31.75 mm centering mask
    Ø 6, 8 o 10 mm shaft

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