Siemens Simatic ET200pro Operating Instruction page 142

Glossary
SNMP
SNMP (Simple Network Management Protocol) is the standardized protocol for performing
diagnostics on and assigning parameters to the Ethernet network infrastructure.
In the office setting and in automation engineering, devices from a wide range of vendors on
the Ethernet support SNMP.
SNMP-based applications can be operated in parallel with PROFINET applications on the
same network.
The scope of supported functions varies depending on the device type.
Substitute value
Substitute values are parameterizable values that output modules output to the process
when the CPU is in STOP mode.
Switch
PROFIBUS is based on a line topology. The communication nodes are linked by means of a
passive cable - the bus.
By contrast, Industrial Ethernet consists of point-to-point connections: each communication
node is interconnected directly with precisely one other communication node.
If you want to link a communication node to several communication nodes, you connect this
communication node to the port of an active network component - the switch. You can now
connect other communications devices (including switches) to the other ports of the switch.
The connection between a communication node and the switch remains a point-to-point
connection.
A switch thus has the task of regenerating and distributing received signals. The switch
"learns" the Ethernet address(es) of a connected PROFINET device or of other switches,
and forwards only the signals intended for the connected PROFINET device or switch.
A switch has a specific number of connections (ports). Connect a maximum of one
PROFINET device or other switch to any port.
Technological functions
see "PROFINET component"
Technology object
A technology object supports you in the configuration and commissioning of a technological
function.
The properties of real objects are represented by technology objects in the controller. Real
objects can be, for example, controlled systems and drives.
The technology object contains all data of the real object required for its open-loop or closed-
loop control, and it signals back status information.
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CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA