Siemens Simatic ET 200S Operating Instructions Manual page 321

Isolated
In the case of isolated input/output modules the reference potentials of the control circuit and
the load current circuit are galvanically isolated; e.g. by means of optocouplers, relays or
transformers. Input/output circuits can be grouped.
MAC address
Each PROFINET device has a factory-assigned worldwide unique device identification. This
6-byte device identification is the MAC address.
The MAC address consists of:
• 3-byte manufacturer ID
• 3-byte device ID (serial number)
As a rule the MAC is placed legibly on the front of the device
e. g.: 08-00-06-6B-80-C0
Master
When it has a token, a master can send data to and request data from other nodes (= active
participants). Examples of DP masters are the CPU 315-2 DP or the IM308-C.
Motor starter (MS)
Motor starter is the generic term for → direct and → reversing starters. The startup and
direction of rotation of a motor are determined by motor starters.
Node
Device which can send, receive or enhance data via the bus,
e. g. DP-Master, DP-Slave, RS 485-Repeater.
Non-isolated
In the case of non-isolated input/output modules, the reference potentials of the control and
load circuits are electrically connected.
Parameter assignment
Parameter assignment is the transfer of slave parameters from the DP master to the DP
slave.
PELV
Protective Extra Low Voltage = extra low voltage with safe isolation
Power buses (P1/ P2)
Two internal buses (P1 and P2) that supply the electronic modules with voltage. The power
buses are fed by the power module and connected by means of the terminal modules.
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
Glossary
Glossary-5