Siemens SIMATIC NET User Manual

Connection
6.4 Optical channels
Optical link module
Operating Instructions, 01/2020, C79000-G8976-C270-06
49
Measuring the receive level
1. Measure the level with a high-resistance, ungrounded voltmeter.
2. Do not connect the ground connector to the housing; otherwise the data traffic could be
disturbed.
3. To meet the EMC requirements, the length of the connected measuring cables must not
exceed 3 m.
The quality of the bus traffic can be estimated based on the receive levels in the following
diagram:
①
Normal operation, level adequate
②
Optical link power margin reduced
③
Function not guaranteed
Figure 6-1 Relationship between measured output voltage and signal quality

Siemens SIMATIC NET Specifications

General

Category	Industrial Communication Software
Manufacturer	Siemens
Operating Systems	Windows, Linux
Protocols Supported	PROFIBUS, PROFINET, OPC UA
Compatibility	Siemens PLCs, Third-party devices with supported protocols