Siemens SIMATIC ET 200AL, System Manual

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Glossary
Communication
Function Manual, 05/2021, A5E03735815-AJ
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IO device, PROFINET IO device
Device in the distributed I/O of a PROFINET system that is monitored and controlled by an IO
controller (for example distributed inputs/outputs, valve islands, frequency converters,
switches).
IP address
Binary number that is used as a unique address in computer networks in conjunction with the
Internet Protocol (IP). It makes these devices uniquely addressable and individually accessible.
An IPv4 address can be evaluated using a binary subnet mask that results in a network part or
a host part as a structure. The textual representation of an IPv4 address consists, for example,
of 4 decimal numbers with the value range 0 to 255. The decimal numbers are separated by
periods.
IPv4 subnet mask
Binary mask, with which an IPv4 address (as a binary number) is divided into a "network part"
and a "host part".
ISO protocol
Communications protocol for message or packet-oriented transfer of data in an Ethernet
network. This protocol is hardware-oriented, very fast and allows dynamic data lengths. The
ISO protocol is suitable for medium to large volumes of data.
ISO-on-TCP protocol
Communications protocol capable of S7 routing for packet-oriented transfer of data in an
Ethernet network; provides network addressing. The ISO-on-TCP protocol is suitable for
medium and large volumes of data and allows dynamic data lengths.
Linear bus topology
Network topology characterized by the arrangement of the devices in a line (bus).
MAC address
Worldwide unique device identification for all Ethernet devices. The MAC address is assigned
by the manufacturer and has a 3-byte vendor ID and 3-byte device ID as a consecutive
number.
Master
Higher-level, active participant in the communication/on a PROFIBUS subnet. The master has
rights to access the bus (token) and can request and send data.
→ See also DP master