Siemens 6GK1970–5CA20–0AA2 Instructions De Montage page 358

Infrared Link Modul (ILM)
Washer
Nut M6
Bolt M6 x 16
Two toothed washers
Washer
Installation of the ILM with mounting bracket
top view
Figure 14: Top View of the PROFIBUS ILM Installed With Mounting Brackets
Copyright  by Siemens
Alignment by installing in other holes
Mounting bracket 2
Secured on
base with two M4
bolts
Mounting bracket 1
ILM ILM
Direction of emission
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6ZB530–3AC30–0BA1