Siemens Simatic S7-1500R System Manual page 321

Glossary
SELV
Safety Extra Low Voltage = Safety extra-low voltage
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.
You can operate SNMP-based applications on the same network in parallel to applications
with PROFINET.
The scope of supported functions varies 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 linked by means of a passive
cable - the bus.
By contrast, Industrial Ethernet consists of point-to-point connections: Each communication
node is directly connected to exactly one 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
connect other communication nodes (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 MAC addresses of a connected PROFINET device or additional switches. The
switch only forwards those signals that are intended for the connected PROFINET device or
switch.
A switch has a specific number of connections (ports). You connect at most one PROFINET
device or additional switch to each port.
Synchronization module
You use the synchronization modules to create the redundancy connections between the
CPUs of the redundant S7-1500H system. You need two synchronization modules per CPU
that you connect in pairs with fiber-optic cables.
System power supply
Consists of the integrated system power supply of the CPU/interface module and additional
power supplies (PS), if necessary. The system power supply powers the CPU and the I/O
modules via the backplane bus.
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S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA