Siemens SIMATIC NET PROFIBUS Owner's Manual page 239

Functions
The ILM allows a wireless link with PROFIBUS slaves at a maximum range of 15
m. Communication with several slaves is possible. Interruptions in transmission are
detected and indicated by LEDs and the signaling contact. If there is a
deterioration in the transmission quality, this is indicated by LEDs and the signaling
contact before data transmission is stopped.
The module can be operated in daylight thanks to an integrated filter. When
installing the Infrared Link Module, make sure that there is a free line-of-sight link
between the modules.
When using several ILM transmission paths, avoid one path interfering with
another by including partitions or maintaining minimum clearances.
Ordering Data:
PROFIBUS ILM
Infrared Link Module for wireless
links between PROFIBUS nodes
and segments
Operating Instructions
The full Operating Instructions are included in the Appendix of this manual.
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Active Components for Wireless Networks
Order number 6GK1 503-0AA00
9-3