Siemens SIMATIC S7-1500 System Manual page 235

PROFINET IO device
Distributed field device that can be assigned to one or more IO controllers (e.g. distributed
I/O system, valve terminals, frequency converters, switches).
Push-in terminal
Terminal for the tool-free connection of wires.
Reference potential
Potential from which the voltages of the circuits involved are observed and/or measured.
Restart
During a restart (warm restart), all non-retentive bit memory is deleted and non-retentive DB
contents are reset to the initial values from load memory. Retentive bit memory and retentive
DB contents are retained. Program execution begins at the call of the first startup OB.
Row
All the modules attached to a mounting rail.
SELV
Safety Extra Low Voltage = Safety extra-low voltage
Sensor
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 may only exchange data with a master after being requested to by the master.
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 many different vendors
support SNMP on the Ethernet.
SNMP-based applications can be operated 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.
Automation system
System Manual, 12/2014, A5E03461182-AC
Glossary
235