Encoder MEM – BUS EtherCAT

Absolute encoders MEM-BUS EtherCAT comply with Profile CANopen over EtherCAT (CoE), Cia DS-406.

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

Download: Encoder MEM – BUS EtherCAT