
Communication Aspects of IEC 61499 Architecture 55-11
Provisions of the compliance prole were implemented, for example, in FBDK [2] as the pairs of
PUBLISH_n/SUBSCRIBE_n
and
CLIENT_n_m/SERVER_n_m
FBs.
e
PUBLISH/SUBSCRIBE
com-
munication
is
implemented
using
services
of
the
universal
datagram
protocol
(UDP).
e
communica-
tion
is
essentially
unreliable
and
multicast.
e
CLIENT/SERVER
communication
is
implemented
via
the
transfer control protocol (TCP). It is point-to-point and reliable.
Using
this library of communication FBs, a user can develop distributed applications communi-
cating via local networks (Ethernet) and even via the Internet. T ...