Lw215_01g_oi_e.doc / Apr-16
Page 5 / 10
2.
Description
The optical fiber modules LW213/LW214 and LW215/LW216 form together a transmission system
for data transmission of industrial signals by means of optical fibers.
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.
Differential signals with RS422 or Push-pull HTL levels from other sources may also be connected
to these devices.
The modules are available with various wave lengths, level and supply voltage variants.
The optical fiber modules are mainly used for signal transmission in environments with strong
electromagnetic interference, or when a potential separation is necessary due to high ground
potential differences between signal source and signal processing equipment.
High ground potential differences generally appear in applications with long distances between
the encoder/sensors and the PLC or any other processing electronics.
The optical fiber 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
fiber.
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 fiber cable, any
transmitter can be combined with any receiver.
The optical fiber cable can be routed through explosive areas.
With 850 nm wave length, signals can be transmitted up to 2000 meters wide,
and with 1300 nm wave length up to 3000 meters wide.
