Glossary
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
259
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.
MIB
An MIB (Management Information Base) is a data base of a device. SNMP clients access
this data base in the device. The S7 device family supports, among others, the following
standard MIBs:
● MIB II, standardized in the RFC 1213
● LLDP MIB, standardized in the international standard IEE 802.1AB
● LLDP PNIO-MIB, standardized in the international standard IEE 61158-6-10
Non-isolated
For non-isolated I/O modules the reference potentials of the control and load circuits are
electrically connected.
Parameter assignment
By assigning parameters you set a module's behavior.
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