Glossary
ET 200M
258 Operating Instructions, 04/2022, EWA-4NEB7806006-09
LAN
Local Area Network; interconnects multiple computers within a company. The geographical
topology of a LAN is limited to the local premises and is only available to the operating
company or institution.
LLDP
LLDP (Link Layer Discovery Protocol) is a protocol that is used to detect the closest neighbors.
It enables a device to send information about itself and to save information received from
neighboring devices in the LLDP MIB. This information can be looked up via the SNMP. This
information allows a network management system to determine the network topology.
Load power supply
Power supply for signal and function modules, including any attached process I/O modules.
MAC address
Every PROFINET device is assigned a worldwide unique device identification before it leaves
the factory. This 6-Byte long device identification is the MAC address.
The MAC address consists of:
• 3-byte vendor identifier and
• 3-byte device identifier (consecutive number).
The MAC address is generally shown on the front of the device, for example: 08-00-06-6B-80-
C0
Mass
The mass is the total of all interconnected, inactive product parts which will not carry
hazardous contact voltage even when a fault or error occurs.
Master
If a master has ownership of the token it can send data to other nodes and request data from
other nodes (=active node).
→ DP masters include CPU 315-2 DP and IM 308-C.
Master-slave process
Bus access method where only one node is → DP master, and all other nodes are → DP slaves.
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