Siemens SIMATIC CPU 1515SP PC2 F - Page 128

List of abbreviations
B.1 Abbreviations
CPU 1515SP PC2 (F/T/TF)
Operating Instructions, 09/2018, A5E42603425-AA
127
Abbreviation
Term
Meaning
PG Programming device Compact programming device which meets the special re-
quirements of industry. The PG is fully equipped for program-
ming SIMATIC PLCs.
PS Power supply Power supply
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.
RT
Runtime
SD
Secure Digital card
Memory card
SELV Safety Extra Low Voltage Safety Extra Low Voltage; electrical circuit in which the volt-
age cannot exceed 30 V AC (RMS), 42.4 V AC peak or
60 V DC under NORMAL CONDITIONS and CONDITIONS
OF A SINGLE FAULT, including ground faults in other circuits.
UL
Underwriters Laboratories Inc.
UWF Unified Write Filter Configurable write protection under Windows 10, for protec-
tion of data carriers (for example, CFast card, internal USB
drives, etc.)"Unified Write Filter (UWF)" write filter (Page 57)
USB Universal Serial Bus Serial bus system for connecting a computer to external de-
vices.