Industrial Communication Systems

34-6 Industrial Communication Systems

Moreover, some spare time is available in each microcycle for the transmission of asynchronous

trac.

is

will

allow

the

BA

to

consider

additional

requests

for

asynchronous

trac

and

allocate

them

into

a

suitable

time

slot.

If

no

request

is

received,

the

BA

will

transmit

padding

identier

(i.e.,

identiers

that

do

not

refer

to

any

station)

until

the

end

of

the

elementary

cycle,

in

order

to

indicate

to

the

other

stations

tha

t

it is sti

ll

act

ive.

Looking at Figure 34.5, we can observe that the schedule is repeated aer a number of microcycles

(12 in the example considered). is interval is called macrocycl ...