Siemens SIMATIC NET PROFIBUS, Owner'S Manual, Page: 349 / 490

Infrared Link Modul (ILM) 6ZB5530–3AC30–0BA1
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Copyright
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by Siemens
3 Introduction
The SIMATIC NET PROFIBUS ILM (Infrared Link Module) is intended for use in PROFIBUS networks. It allows
the conversion of electrical PROFIBUS interfaces (RS 485 level) into transmittable light signals in the infrared,
invisible wavelength range and vice-versa.
With the PROFIBUS ILM, it is possible to link an existing PROFIBUS network with a second PROFIBUS
network without a physical cable connection between the two subnets (electrical cables or fiber-optic cable).
The PROFIBUS ILM is therefore particularly suitable for cableless links with the following:
â
Turntables
â
Automatic transport systems
â
Modifiable test equipment
The transmission is optical and therefore depends on line-of-sight contact between two PROFIBUS ILMs. Apart
from point-to-point links, point-to-multipoint links are also possible.
At least two PROFIBUS ILMs are necessary for a transmission link.