Technical data

PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
341
Glossary
Active RS 485 terminator
Separate -> terminating resistor in bus segments at transmission rates of 9.6 kbps to 12
Mbps. The power supply is separate from the bus nodes.
Baud rate
-> Transmission speed
Bus
Data transfer bus to which all nodes are connected. It has two defined ends.
In the case of PROFIBUS, the bus is a twisted-pair cable or optical fiber cable.
Bus connector
Physical connection between the node and bus cable.
The following bus connectors are available in SIMATIC NET
● D-sub (9-pin) with and without a connector for the PG, with degree of protection IP20
● M12 with socket or pin contacts with degree of protection IP65/67.
Bus segment
-> Segment
Bus system
All nodes physically connected to a bus cable form a bus system.
Configuring
Configuring means entering a PROFIBUS configuration with all the specific parameters
using, for example, STEP 7 or COM PROFIBUS.
Electromagnetic compatibility (EMC)
Electromagnetic compatibility (EMC) deals with all questions of electrical, magnetic and
electromagnetic emission and immunity and the functional disturbances in electrical devices
resulting from these effects.