Glossary
PROFIBUS with STEP 7 V13
98 Function Manual, 12/2014, A5E03775446-AC
Standardized metal profile to EN 50022.
The standard mounting rail is used for quick snap-on installation of network components,
such as OLM, repeaters, etc.
Part of a network whose parameters must be synchronized with the devices
(e.g., with PROFIBUS). A subnet includes the bus components and all connected stations.
Name for synchronous cycle interrupt OB in STEP 7.
Target-Rotation-Time (Ttr)
Bus parameter for PROFIBUS. The token is the send permission for a device on
PROFIBUS. A device compares a token rotation time it has measured with the Target-
Rotation-Time and controls the sending of frames with high priority or low priority based on
this comparison.
Component that terminates the ends of a data transmission line to prevent reflections in the
transmission medium.
Terminating resistor of bus segments with transmission rates of 9.6 kbps to 12 Mbps. The
power supply is separate from the bus nodes.
Totally Integrated Automation Portal
Structure of a network. Common structures are line topology, ring topology, star topology
and tree topology.
Specifies the number of bits transmitted per second.
Mechanism for monitoring the readiness for operation.
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