158 Glossary
WAGO-I/O-SYSTEM 750
753-668/000-004 4FAI 0/4-20 mA Diff PROFIsafe
Manual
Version 1.0.0, valid from HW/SW Version 01/01
P
Passivate, Passivation
Passivation of safe analog inputs or power outputs is performed automatically by
the F I/O module after activation or detection of errors. Operator acknowledgment
is required after passivation, so that the F I/O module can start.
PE (Protective Earth)
The PE is connected to the ground connector according to IEC 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 hour.
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.
Process Value
The process value is the input measured value converted per the analog value
representation and transferred to the safe PLC in the process image.
PROFIsafe
Safety-oriented data communication via the standard PROFIBUS or PROFINET
(black channel).
PROFIsafe Address
Address that must be assigned to a safe device with PROFIsafe data
communication, so that data communication can be established between a
PROFIsafe master and a PROFIsafe slave.
PROFIsafe Mode V2.4
PROFIsafe Mode V2.6
PROFIsafe
– Profile for Safety Technology on PROFIBUS and PROFINET Profile
part, related to IEC 61784-3-3 Technical Specification Version 2.6 MU1
Proof Test
Proof test or recurring test that is performed to discover failures in a safety-
related system, so that the system can be brought to a “like-new state” or as
close as possible to this state from a practical perspective.