Siemens SIMATIC S7-1500 System Manual page 233

Interface module
Module in the distributed I/O system. The interface module connects the distributed I/O
system to the CPU (IO controller) via a fieldbus, and prepares the data for and from I/O
modules.
Isolated modules
In the case of isolated input/output modules, the reference potentials of the control and load
circuits are galvanically isolated, e.g. by means of optical isolators, relays or transformers.
Input/output circuits can be connected to common potential.
Load current supply
Supply of the module's input and output electric circuits.
MAC address
worldwide, clear device identification, which is already assigned to each PROFINET device
in the factory. The 6 bytes of the address consist of a 3-byte manufacturer ID and a 3-byte
device ID (serial number). The MAC address is usually clearly legible on the device.
Nodes
Device that can send, receive or amplify data via the bus, e.g., I/O device via PROFINET IO.
Non-isolated modules
In the case of non-isolated input and output modules, the reference potentials of the control
and load circuits are electrically connected.
Parameter assignment
Parameter assignment is the transfer of parameters from the IO controller / DP master to the
IO device / DP slave.
PELV
Protective Extra Low Voltage = grounded extra low voltage with safe isolation
Pre-wiring
Wiring of the electrical system on the front connector before the front connector is used on
the I/O module.
Automation system
System Manual, 12/2014, A5E03461182-AC
Glossary
233