Siemens Simatic CFU Commissioning Manual page 161

Redundancy, availability-enhancing
Multiple instances of components with the objective of maintaining component functionality in
the event of hardware faults.
Reference potential
Potential from which the voltages of the participating circuits are considered and/or measured.
SELV
Safety Extra Low Voltage
Sensors
Sensors are used for accurate detection of digital and analog signals as well as routes,
positions, velocities, rotational speeds, masses, etc.
Slave station
A slave can only exchange data after being requested to do so by the master.
SNMP
SNMP (Simple Network Management Protocol) is the standardized protocol for diagnosing
and also configuring the Ethernet infrastructure.
In the office area and in automation technology, devices support a wide range of manufacturers
on the Ethernet SNMP.
SNMP-based applications can be operated on the same network in parallel to applications
with PROFINET.
Spur
Spur line to a field device
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 interconnected directly with precisely one other communication node.
If a communication node is linked to several communication nodes, this communication node
is connected to the port of an active network component - the switch. Other communications
devices (including switches) can then be connected to the other ports of the switch. The
connection between a communication node and the switch remains a point-to-point connection.
SIMATIC CFU
Commissioning Manual, 07/2018, A5E39252870-AC
Glossary
161