Siemens ET 200pro Operating Instructions Manual page 532

Glossary
Isolated
The reference potentials of the control and load circuit of isolated I/O modules are electrically
isolated, for example, by means of optocouplers, relays or transformers. The I/O circuits can
be connected to a common potential.
LAN
Local area network. Interconnects computers within an enterprise. The LAN therefore has a
limited geographical span and is solely available to a company or institution.
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 is divided into:
● 3-byte manufacturer identification and
● 3-byte device identification (consecutive number).
The MAC address is generally shown on the front of the device,
for example: 08-00-06-6B-80-C0
Master
A master which is in possession of the token can send data to other devices and request
data from them (= active device). DP masters are, for example, the 315-2 DP CPU or
IM308-C.
Non-isolated
The reference potentials of the control and load circuit of non-isolated I/O modules are
electrically interconnected.
Parameter assignment
Refers to the transfer of slave parameters from the DP master to the DP slave.
PELV
Protective Extra Low Voltage = extra low voltage with safe isolation
PM
Power module: The power module provides a new potential group for the 2L+ load voltage
supply.
532
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08