Glossary
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
Glossary-11
MAC address
Each PROFINET device is assigned a worldwide unique device identifier in the factory. This
6-byte long device identifier is the MAC address.
The MAC address is divided up as follows:
• 3 bytes vendor identifier and
• 3 bytes device identifier (consecutive number).
The MAC address is normally printed on the front of the device.
Example: 08-00-06-6B-80-C0
Master
See Slave
When a master is in possession of the token, it can send data to other nodes and request
data from other nodes (= active node).
Memory Card (MC)
Memory Cards are memory media for CPUs and CPs. They are implemented in the form of
RAM or FEPROM. An MC differs from a Micro Memory Card only in its dimensions (MC is
approximately the size of a credit card).
Micro Memory Card (MMC)
Micro Memory Cards are memory media for CPUs and CPs. Their only difference to the
Memory Card is the smaller size.
Module parameters
Module parameters are values which can be used to configure module behavior. A
distinction is made between static and dynamic module parameters.
MPI
The multipoint interface (MPI) is the programming device interface of SIMATIC S7. It enables
multiple-node operation (PGs, text-based displays, OPs) on one or several PLCs. Each node
is identified by a unique address (MPI address).
MPI address
See MPI
NCM PC
See SIMATIC NCM PC
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