Glossary - Siemens SIMATIC NET PROFIBUS Owner's Manual

Glossary

Baud rate
–> Transmission rate
Bus
Common transmission path on which all nodes are connected; it has two defined
ends.
In PROFIBUS, the bus is a twisted-pair cable or a fibre-optic cable.
Bus connector
Physical connection between the node and LAN cable.
In SIMATIC NET, there are bus connectors with and without sockets for the PG
with the degree of protection IP 20.
Bus segment
³ Segment
Bus system
All stations that are physically connected via a LAN cable form a bus system.
Chassis ground
Chassis ground includes all the interconnected inactive parts of equipment that
must not carry a hazardous voltage even in the event of a fault.
Configuring
Configuring means entering a PROFIBUS configuration with all the specific para-
meters using, for example, STEP 7 or COM PROFIBUS.
d.c. loop resistance
Total resistance of the outward and return line of a cable.
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Glossary-1