Siemens SIMATIC S7-1500/ET 200MP System Manual page 378

PELV
Protective Extra Low Voltage = safety extra low voltage connected to protective earth
Pre-wiring
Wiring of the electrical system on the front connector before the front connector is used on
the I/O module.
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 of the inputs. At the end of the cyclic program the process image of the
outputs is transmitted as signal state to the output modules.
Product version (PV) = Function version (FV)
The product version or function version 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 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 IO devices. Often, the IO
controller is the CPU on which the automation program runs.
Automation system
System Manual, 01/2023, A5E03461182-AK
Glossary
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