Abbreviations
CPU 1515SP PC (F)
136 Manual, 05/2017, A5E32701806-AC
PELV Protective Extra Low Voltage PELV, previously called "extra low voltage with safe isolation",
is a protective measure against electrical shock. See EN
PN PROFINET
PG Programming device Compact programming device which meets the special re-
quirements of industry. The PG is fully equipped for program-
PT Power Tags Process tags; tags enable data exchange between the com-
ponents of an automation process, for example, between the
HMI device and the controller.
RAM Random Access Memory Main or work memory of a computer with direct access, allow-
ing read access to data and editing.
SELV Safety Extra Low Voltage Safety extra-low voltage; protective measure in which circuits
with a rated voltage of up to 50 V AC or 120 V DC are operat-
ed ungrounded and feeds from circuits with a higher voltage
are separated from these by, for example, a safety transform-
Underwriters Laboratories Inc.
USB Universal Serial Bus Serial bus system for connecting a computer to external de-
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