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M3120-00X | Lightbus incremental encoder interface


The M3120 module permits up to four incremental encoders to be connected to the Lightbus system. A 24 bit counter with a quadrature decoder and a 24 bit latch for the zero pulse can be read, set or enabled for each transducer. The fibre optics connection of the Lightbus system allows the transducer values to be transmitted at high speed and without interference to a central device such as a PC, PLC or CNC. Up to 255 transducers can be interrogated over one fibre optic ring.


  • integration of all digital functions into one LCA (logic cell array) circuit
  • quadrature decoder with 1-, 2- and 4-fold evaluation
  • 24 bit counter with 1 MHz frequency limit
  • 24 bit latch for counter value at zero pulse
  • read, set and activate commands for counter and zero-pulse registers via Lightbus system
  • 4 connections for 3-channel incremental transducers


Technical data  
Fieldbus Lightbus
Data transfer rates 2.5 Mbaud, 32 bits of process data in 25 µs
Encoder connection A, A(inv), B, B(inv), zero, zero(inv), status
Encoder operating voltage optionally 5 V DC/15 V DC
Counter 24 bits, binary
Limit frequency 1 MHz
Quadrature decoder 1-, 2-, or 4-fold evaluation
Zero-pulse latch 24 bits
Commands read, set, enable
Supply voltage 24 V DC (-15 %/+20 %)
Current consumption 0.1 A (without sensor load current)
Housing form compact continuously cast aluminium housing, can be clipped to device carrier rail
Dimensions (W x H x D) 166 mm x 76 mm x 63 mm
Operating/storage temperature 0…+55 °C/-25…+85 °C
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27/29
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4



Ordering information  
M3120-001 1-channel incremental encoder interface module
M3120-002 2-channel incremental encoder interface module
M3120-003 3-channel incremental encoder interface module
M3120-004 4-channel incremental encoder interface module