Rockwell Automation Publication ICSTT-RM448J-EN-P - April 2018
161
Glossary
F
fail operational state
A state in which the fault has been masked. See 'fault tolerant'.
fail safe
The capability to go to a pre-determined safe state in the event of a specific
malfunction.
fault reset button
The momentary action push switch located on the front panel of the 9110
processor module.
fault tolerance
Built-in capability of a system to provide continued correct execution of its
assigned function in the presence of a limited number of hardware and
software faults.
fault tolerant
The capability to accept the effect of a single arbitrary fault and continue
correct operation.
fault warning receiving station
A centre from which the necessary corrective measures can be initiated.
fault warning routing equipment
Intermediate equipment which routes a fault warning signal from the control
and indicating equipment to a fault warning receiving station.
field device
Item of equipment connected to the field side of the I/O terminals. Such
equipment includes field wiring, sensors, final control elements and those
operator interface devices hard-wired to I/O terminals.
fire alarm device
A component of a fire alarm system, not incorporated in the control and
indicating equipment which is used to give a warning of fire — for example a
sounder or visual indicator.
fire alarm receiving station
A centre from which the necessary fire protection or fire fighting measures can
be initiated at any time.
fire alarm routing equipment
Intermediate equipment which routes an alarm signal from control and
indicating equipment to a fire alarm receiving station.
function block diagram
An IEC 61131 language that describes a function between input variables and
output variables. Input and output variables are connected to blocks by
connection lines. See 'limited variability language'.
functional safety
The ability of a system to carry out the actions necessary to achieve or to
maintain a safe state for the process and its associated equipment.
