Siemens SIMATIC ET 200S Manual page 585

Motor starter (MS)
Motor starter is the generic term for → direct-on-line and → reversing starters. The
startup and direction of rotation of a motor are determined by motor starters.
Node
A device that can send, receive, or repeat data on the bus (for example, a
DP master, DP slave, or RS 485 repeater).
Non-isolated
In the case of non-isolated input/output modules, the reference potentials of the
control and load circuit 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 = functional extra-low voltage with safe disconnection
Potential group
A group of electronic modules supplied by a power module.
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.
Prewiring
The wiring of the terminal modules before the electronic modules are inserted.
Process image
The process image is a component of the system memory of the DP master. The
signal states of the input modules are transferred to the process-image input area
at the beginning of the cyclic program. At the end of the cyclic program, the values
of the process-image output area are transferred to the DP slave as the signal
states.
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Glossary
Glossary-5