Siemens SIMATIC NET PROFIBUS Owner's Manual page 348

Infrared Link Modul (ILM)
2 Symbols
LAN cable (twisted pair)
Bus connector
terminating resistor deactivated
Bus connector
terminating resistor activated
Master
Slave
ILM
ILM
+
4
Copyright by Siemens
Active or (or passive) bus node
Passive bus node
Infrared link module (ILM)
terminating resistor activated
Infrared link module (ILM)
terminating resistor deactivated
Important information and notes
"Sequence of actions" to be performed by the user.
6
6ZB530–3AC30–0BA1