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PELV
Protective Extra Low Voltage
Performance Level
Performance Level (PL) according to ISO 13849-1:2006 or EN ISO 13849-1:2008
Potential group
Group of I/O modules that are jointly supplied with voltage.
Prewiring
Wiring the electrics on a mounting rail before the I/O modules are connected.
Process image (I/O)
The CPU transfers the values from the input and output modules to this memory area. At the
start of the cyclic program, the signal states of the input modules are transmitted to the
process image input. At the end of the cyclic program, the process image output is
transmitted as signal state to the output modules.
Product version (ES) = Functional status (FS)
The product version or functional status provides information on the hardware version of the
module.
PROFIBUS
PROcess FIeld BUS, process and fieldbus standard that is specified in IEC 61158 Type 3. It
specifies functional, electrical and mechanical properties for a bit-serial fieldbus system.
PROFIBUS is available with the following protocols: DP (= Distributed Periphery), FMS (=
Fieldbus Message Specification), PA (= Process Automation) or TF (= Technological
Functions).
PROFINET
PROcess FIeld NETwork, open industrial Ethernet standard which continues PROFIBUS
and Industrial Ethernet. A cross-manufacturer communication, automation and engineering
model by PROFIBUS International e.V., defined as an automation standard.
PROFINET IO controller
Device used to address connected I/O devices (e.g. distributed I/O systems). This means:
The IO controller exchanges input and output signals with assigned I/O devices. The IO
controller often corresponds to the CPU in which the automation program is running.
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG
Glossary
301
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