October 2018
Intermediate to advanced
962 pages
40h 41m
English
Content preview from Industrial Communication Systems
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24-6 Industrial Communication Systems
transmissions of each terminal. Finally, the synchronization gap (SG) is a common quiet time, longer
than
any individual TG, which is used to synchronize all the terminals at the beginning of a new cycle.
ese three timers are used at each terminal in the following manner:
•
e
TI timer starts immediately every time the terminal begins transmitting.
•
e
SG
timer
starts
immediately
every
time
the
bus
is
sensed
quiet.
is
timer
may
be
reset
before
it
has
elapsed
if
any
activity
is
detected
on
the
bus.
is
timer
does
not
aect
periodic
mode
but
in
aperiodic
mode,
aer
it
has
elapsed
we
know
that
all
the
ter
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