Industrial Communication Systems

21-6 Industrial Communication Systems

a requirements document. erefore, such documentation should be available. It also remains to be

decided

at

which

granularity

the

analysis

is

carried

out.

A

high-level

system

function

can

usually

be

divided

into

a

number

of

sub-functions,

which

can

in

turn

be

divided

into

more

sub-functions.

e

lower

the

level

at

which

the

analysis

is

conducted,

the

more

eort

is

required,

but

the

more

benet

can

be

gained

from

the

analysis.

e

right

level

of

the

analysis

should

be

decided

at

the

beginning.

It

will

generally

always

be

a

compromise

between

rigor

and

eciency.

A

good

starting

point

for

the

analysis

is

the ...