Connection To The Profibus System; Basics; Warning About Measurements On Running Systems; Connection Types For Profibus Devices - Profibus PB-Q ONE User Manual

Connection to the PROFIBUS system

3 Connection to the PROFIBUS system

3.1 Basics

3.1.1 Warning about measurements on running systems

Caution: When connecting a measuring device, effects on the system to be inspected cannot be
ruled out completely. With unstable PROFIBUS systems, malfunctions of the system may occur
in rare cases. Always observe the connection information!

3.1.2 Connection types for PROFIBUS devices

Depending on the device version, there are different ways to connect bus modules to a PROFIBUS network:
 Connecting via plug-in connectors
o
D-Sub plug-in connector, usually with an integrated terminal resistor, and optionally with an
additional service jack
o
M12 screw-in connector in the field for higher IP ratings
o
Special manufacturer-specific hybrid plug-in connectors for routing the power supply over the bus
in conjunction with special cables
 Direct cable connection via terminals
Due to the typical linear structure of the PB networks, the available measuring points are usually limited to
the connecting points of the bus devices. Alternatively, the use of additional measuring points (e.g. Profibus
measurement adapter, PBMA) may be viable.

3.1.3 Adapter cable

The standard scope of supply of the
is available as an optional accessory.
Use only the short original cables with special pin allocation for connecting to a PROFIBUS
network. No more than two D-Sub connectors must be cascaded to the service jack at a time.
The use of active connecting cables with integrated repeaters for measurement is not possible.
ONE
PB-Q - User Manual
ONE
PB-Q includes the 9-pin D-Sub adapter cable. An M12 adapter kit
Figure 2: Improper cascading of D-Sub connectors
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