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Innovative optical fiber modules for sensor signals

Supplier: Plant Control & Automation By: Ron R.
12 December, 2012

Plant Control and Automation offers new optical fibre links developed by Motrona of Germany. Safe and reliably transmission of signals, up to a distance of 3000m

The optical fibre modules available are LW213, LW214, LW215, LW216, LW217 and LW218.

LW213, LW214, LW215 and LW216 Specs

Both, transmitter and receiver modules, provide four channels which are completely independent
of each other, with differential inputs and outputs. All four channels allow the transmission of signals with a maximum data rate of 2 Mbit/s. With their technical features, the optical fiber modules are intended for the transmission of signals from incremental encoders and sensors.

  • The optical fiber modules LW213/214 or LW215/216 are building together a data transmission system for incremental signals of encoders or sensors by means of an optical fiber.
  • LW213 and LW214 offer Safe and reliably transmission of signals, up to a distance of 3000 meters
  • LW215 and LW216 offer Safe and reliably transmission of signals, up to a distance of 2000 meters
  • The optical fiber cable can be routed through explosive areas as well
  • Resistant against extremely strong electromagnetic fields
  • For use with all incremental encoders and sensors either with TTL/RS422 output or with HTL (10-30V) output
  • Four channels allow the transmission of signals with a maximum data rate of 2 MBit/s
  • Maximum input clock frequency 1 MHz
  • Power supply either 5 VDC or 10-30 VDC
  • Compact DIN rail mounting
  • Already assembled optical fiber cables are available

LW217 & LW218 Specs

The system is made of an optical fibre transmitter and of an optical fibre receiver. The optical fibre transmitter module converts the electrical data of a usual sensor or encoder equipped with a synchronous serial interface (SSI) into optical fibre signals. The optical fibre receiver module converts the optical signals back into electrical SSI signals.

  • Used together a transmission system for data transmission of SSI signals by means of optical fibres.
  • LW217 and LW218 offer safe and reliably transmission of signals up to a distance of 1500m
  • The optical fibre cable can be routed through explosive areas as well
  • Resistant against extremely strong electromagnetic fields
  • For use with all encoders and sensors equipped synchronous serial Interface (SSI)
  • Adjustable maximum SSI resolution of 13 bit or 25 bit
  • Maximum clock frequency 500 kHz
  • Power supply either 5 VDC or 10-30 VDC
  • Compact DIN rail mounting
  • Glass fibre cables are available ready assembled

All modules are equipped with LED’s, allowing a wide diagnosis of operating troubles. In
addition, the receiver module also has a general alarm output with galvanic isolation (optocoupler).

The modules are available in various level and supply voltage variants.

The optical fibre modules are mainly used when signals have to be transmitted in environments
with strong electromagnetic interferences or when, due to high ground potential differences
between the signal source and the signal processing equipment, a potential separation is
necessary.

High ground potential differences generally appear also in case of large distances between the
encoder/sensors and the PLC or any other processing electronics.

The optical fibre cable is failure-safe: it does not constitute any danger in case of damage. Since
the light-emitting component used is not a laser, but a light-emitting diode, the transmission line
is totally safe, even when looking directly into the opened connector or into the broken glass
fibre.

If necessary, a level conversion can be linked with the potential separation without problem.
Since all devices use the same signal transmission protocol on the optical fibre cable, any
transmitter can be combined with any receiver.

For more infomation on these products please call or email us