Siemens SIMOCODE pro C System Manual page 389

PC cable
The PC cable is used to connect the serial interface of the PC to the system interface of a
basic unit for device parameterization.
Note
PC cable variant
For SIMOCODE pro V PN, a serial PC cable 3UF7940-0AA00-0 as from product version
*E02* or a USB PC cable 3UF7941-0AA00-0 can be used.
PELV
Protective Extra-Low Voltage. Protective measure against electric shock (formerly referred to
as "protective extra low voltage with safe isolation").
In contrast to an SELV circuit, live parts and exposed conductive parts of the equipment may
be grounded and connected to the protective conductor. Safe isolation means that the
primary circuit of the transformer must be separated from the secondary circuit by double or
reinforced insulation. PELV is used whenever operational reasons dictate that live
conductors of the low voltage or bodies of the equipment must be grounded. This is the
case, for instance, if equipotential bonding is necessary to prevent sparking in containers or
hazardous areas. However, owing to the chassis ground, dangerous leakage currents can
flow through the body regardless of the low voltage if a fault occurs in the higher-level power
system.
Use of power supply units according to IEC 60536, protection class III (SELV or PELV):
See Chapters "Safety-related tripping", "Fail-safe digital modules (DM-F)", and "DM-F Local
and DM-F PROFIsafe digital modules".
Performance Level (PL)
Defined by standard EN ISO 13849-1 as "a discrete level specifying the ability of
safety-related control parts to execute a safety function under anticipated conditions." Five
performance levels are specified (a to e) with defined ranges of the probability of a
dangerous failure per hour. PL "e" corresponds to SIL 3 and is specified as the highest level.
Performance Level (PL)
Defined by standard EN ISO 13849-1 as "a discrete level specifying the ability of
safety-related control parts to execute a safety function under anticipated conditions." Five
performance levels are specified (a to e) with defined ranges of the probability of a
dangerous failure per hour. PL "e" corresponds to SIL 3 and is specified as the highest level.
Pozidriv (PZ)
Type of fixing screws and cross-tip screwdrivers.
SIMOCODE pro
System Manual, 05/2019, A5E40507475002A/RS-AD/004
Glossary
389