Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021 141
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.
G
group A collection of two or three input modules (or two output modules), arranged
together to provide enhanced availability for their respective input or output
channels.
H
hand-held equipment Equipment which is intended to be held in one hand while being operated with
the other hand.
HART HART (Highway Addressable Remote Transducer) is an open protocol for
process control instrumentation. It combines digital signals with analogue
signals to provide field device control and status information. The HART
protocol also provides diagnostic data. (For more details of HART devices refer
to the HART Application Guide, created by the HART Communication
Foundation, and their detailed HART specifications. You can download
documents from www.hartcomm.org.)
high demand mode Where the Safety Instrumented Function in the Safety System only performs
its designed function on a demand, and the frequency of demands is greater
than one per year.
hot swap See live insertion.
I
I/O base unit A backplane assembly which holds up to three I/O modules and their
associated termination assembly or assemblies in an AADvance controller.
Part number T9300. See 'I/O module' and 'termination assembly'.
I/O module A collation of interfaces for field sensors (inputs) or final elements (outputs),
arranged in a self-contained and standardized physical form factor.
IEC 61000 A series of international standards giving test and measurement techniques
for electromagnetic compatibility.
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