
18-6 Industrial Communication Systems
and exiting, thus, enabling a system to calculate the processing time of a packet in devices. is is
required
for
switches,
which
do
not
have
a
predictable
forwarding
for
packets
or
in
ring
and
line
structures
as
implemented
in
PROFINET.
is
addition
was
introduced
when
it
turned
out
that
the
concept
of
boundary
clocks
of
version
1
suers
from
diculties
caused
by
cascaded
control
loops,
whi
ch
may exh
ibit
sta
bility
pro
blems
ae
r
sev
eral
hop
s.
• In principle, the synchronization accuracy with IEEE 1588v2 can get better than 1 ns. Compared to
version 1, this was made possible by the increased length of several ...