M3120 | 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.

 

Features

• 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	M3120
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	M3120-00x
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