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PELV
Protective Extra Low Voltage = extra low voltage with safe isolation
Persistence
Persistence is the ability to store data structures (or objects) in non-volatile memory such as
file systems or databases. In other words, on the SIMATIC VS120 processing unit, data is
stored and retained if there is a power outage.
PG
Programming device
Ping
A utility for checking connections to one or more remote hosts. The "ping" command uses
the echo packets and echo replies of ICMP to check connectivity with an IP system in a
network. Ping is useful in troubleshooting the IP network or the router.
PLC
Programmable Logic Controller.
Port or port address
Address for a channel for data transfer between an input or output device and the processor.
From the CPU's perspective, a port represents one or more memory addresses to which it
can send data or from which it can receive data. Special hardware such as expansion
boards places data from a device in the memory address and sends data from these
addresses to the device. Some ports are only for input and some only for output.
Processing unit
SIMATIC VS120 hardware unit for the recognition of models and test specimens. Operator
control is interactive using operator buttons and a display field or controlled by signals over
an automation system.
PROFIBUS
Process Field Bus-> International fieldbus standard to EN 50170/IEC 61158
PROFIBUS DP
PROFIBUS-DP (distributed peripheral I/O) is used for controlling sensors and actuators
using a central controller in production engineering. It is also used in connection with
"distributed intelligence", i.e. connecting multiple controllers to form a network. It provides
data transmission up to 12 Mbps on twisted-pair cables and data transmission over sliding
contacts for mobile subscribers in exceptional cases or optical data transmission in
unobstructed space.
Vision Sensor SIMATIC VS120
Operating Instructions, Edition 02/2006, A5E00757507-01
Glossary
Glossary-7
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