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Glossary
Autonegotiation
Configuration protocol in Fast Ethernet. Before the actual data transfer, the devices on the
network agree on a transfer mode that each participating device can work with (100 Mbps or
10 Mbps, full-duplex or half-duplex).
Bus
A common transfer route connecting all nodes and having two defined ends.
BusAdapter
Enables free selection of the connection technology and layout for the PROFINET fieldbus.
Cross-over cable
A cross-over cable is a four-wire or eight-wire twisted pair cable in which specific cable wires
are swapped in one of the two RJ45 connectors. You can use a cross-over cable to connect
two controllers directly with each other.
Data record routing
Forwarding of data records beyond subnet boundaries from a sender to receivers via a router.
Data status byte (for inputs only)
Users need the data status byte (DS) to check the validity of the coupled user data. An
additional byte is added to all input modules; it can be evaluated in the user program.
Device name
Before an IO Device can be addressed by an IO Controller, it must have a device name. This
procedure was selected for PROFINET because names are easier to handle than complex IP
addresses.
Assignment of a device name for a specific IO Device can be compared with the setting of the
PROFIBUS address for a DP slave.
An IO Device does not have a device name upon delivery. Only once a device name has been
assigned using the PG/PC, can an IO Device be addressed by an IO Controller, e.g. for the
transmission of configuring data (including the IP address) during start-up or for the
exchange of useful data in cyclic mode.
PN/MF Coupler
Hardware Installation and Operating Manual, 07/2020, A5E50018670-AA
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