Industrial Communication Systems

33-6 Industrial Communication Systems

Periodic communication is used for the exchange of cyclic process data that support the services

of

the

peripheral

message

specication

(PMS)

through

a

process

data

channel.

PMS

is

a

subset

of

the

manufacturing

message

specication

(MMS).

is

enables

direct

access

to

the

cyclically

transmitted

process

data

and

is

able

to

transmit

process-relevant

data

quickly

and

eciently.

From

the

application

point

of view, it acts as a memory interface.

Instead,

asynchronous communication is used to transfer conguration les provided by the network

management channel (peripheral network management, PNM) through a par ...