156 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
F
Failure
Termination of the capacity of a unit to complete the required function (see also
“Dangerous Failure”).
FG (functional ground)
The FG functional ground is not the same as protective earth (PE) according to
VDE 0100 and is only used as an EMC ground connector.
F parameters
Parameters for configuring data communication between the safe PLC and the
F I/O module
Function Block
Software block executed in a unit that fulfills a sub-function
FVi
Failsafe Values Input
FVo
Failsafe Values Output
H
Hardware Fault Tolerance
Capacity of a safety-oriented unit, subsystem or subsystem element to continue
executing a required safety function even when an error exists
Hazardous Situation
Circumstance in which a person is exposed to at least one hazard. This situation
leads to injury directly or over a period of time.