WAGO -I/O-SYSTEM 750 Series Manual page 130

130 Glossary WAGO-I/O-SYSTEM 750
753-661/000-003 4FDI 24V PROFIsafe V2 iPar
P
Passivate, passivation
Passivation of safe digital inputs or power outputs is performed automatically by
the PROFIsafe I/O module after activation or detection of errors. Operator
acknowledgement is required after passivation, so that the PROFIsafe I/O module
can start.
PE (Protective Earth)
The PE is connected to the ground connector according to EN 60204-1 and is used
as fundamental protection against electric shock when touched indirectly. It is also
used to reduce the effect of electrical interference on electrical equipment that
affect operation of a machine or system.
PFD (Probability of Failure on Demand)
The safety parameter PFD specifies the probability of a dangerous failure.
PFH (Probability of dangerous Failure per Hour)
The safety parameter PFH specifies the probability of a dangerous failure within
one error.
PL (Performance Level)
The Performance Level PL specifies the capacity of safety devices to execute a
safety function under foreseeable conditions.
PLC
A PLC (Programmable Logic Controller) is a device used to control a machine or
system and is programmed on a digital basis.Requirement
Event that the PROFIsafe I/O module causes to execute its safety function
Positively driven contacts, positively driven relays
Positively driven contacts or positively driven operation means that break contacts
and make contacts can never be opened or closed at the same time in a contact
system. It must be ensured that a contact gap of min. 0.5 mm is present throughout
the service life and in the faulted state (contact welding). Relays with positively
driving contacts are normative elementary relays according to IEC EN 61810-1
with special additional properties based on the contact set, whose requirements are
formulated in EN 50205 (see also "Actuator").
PROFIsafe
Safety-oriented data communication via the standard PROFIBUS or PROFINET
(black channel). A distinction is made between V1 mode and V2 mode.
PROFIsafe V1 Mode acc. IEC 61784-3-3
PROFIsafe V1 Mode – Services and protocols of the safety-oriented PROFIsafe
communication profile according to PROFIBUS Guideline: PROFIsafe – Profile
for Safety Technology, V1.30, June 2004.
Manual
Version 1.4.0, valid from HW/SW Version 01/02