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PROFINET IO Device
Distributed field device which is assigned to one of the IO controllers (e.g. remote IO, valve
terminals, frequency converters, switches).
Reference potential
Potential that is used to view and/or measure voltages for each circuit involved.
SELV
Safety extra low voltage (SELV) is voltage ≤ 30 V AC/60 V DC that is generated via a safety
transformer or accumulator.
SNMP
SNMP (Simple Network Management Protocol) is the standardized protocol, for diagnosing
and also configuring the Ethernet network infrastructure.
In the office setting and in automation engineering, devices from many different
manufacturers support SNMP on the Ethernet.
SNMP-based applications can be operated on the same network in parallel to applications
with PROFINET.
The scope of the supported functions differs depending on the device type. For example, a
switch has more functions than a CP 1616.
Switch
PROFIBUS is a linear network. The communication nodes are connected with one another by
means of a passive line - the bus.
By contrast, the Industrial Ethernet consists of point-to-point connections: each
communication node is directly connected to exactly one communication node.
If a communication node is connected with several communication nodes, this
communication node is connected to the port of an active network component - the switch.
Additional communication nodes (including switches) can now be connected to the other
ports of the switch. The connection between a communication node and the switch remains
a point-to-point connection.
A switch also has the task of regenerating and distributing received signals. The switch
"learns" the Ethernet address(es) of a connected PROFINET device or other switches and only
forwards signals, which are destined for the connected PROFINET device or the connected
switch.
A switch has a specific number of ports. You connect at most one PROFINET device or
additional switch to each port.
PN/MF Coupler
Hardware Installation and Operating Manual, 07/2020, A5E50018670-AA
Glossary
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