Siemens SIMATIC S7-1500 System Manual page 263

PROFIBUS
PROcess FIeld BUS, process and fieldbus standard that is specified in IEC 61158 Type 3. It
specifies functional, electrical and mechanical characteristics for a bit-serial field bus system.
PROFIBUS supports the protocols DP (= Distributed I/O), FMS (= Fieldbus Message
Specification), PA (= Process Automation), or TF (= Technological Functions).
PROFINET
PROcess FIeld NETwork, open industrial Ethernet standard which further develops
PROFIBUS and industrial Ethernet. A cross-manufacturer communication, automation, and
engineering model defined by PROFIBUS International e.V. as an automation standard.
PROFINET IO
Communication concept for the realization of modular, distributed applications within the
scope of PROFINET.
PROFINET IO controller
Device used to address connected I/O devices (e.g. distributed I/O systems). This means
that: The IO controller exchanges input and output signals with assigned I/O devices. Often,
the IO controller is the CPU on which the automation program runs.
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 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.
Retentivity
A memory area whose content is retained after power failure and after a STOP to RUN
transition is retentive. The non-retentive area of the bit memory, timers and counters is reset
after power failure and after a STOP to RUN transition.
Automation system
System Manual, 09/2016, A5E03461182-AD
Glossary
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