ABB Advant Controller 450 - Data Set and AL, AO, DI, DO with EXCOM

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3-56 3BSE 002 415R701 Rev A
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The load in an Advant Controller 450 caused by a communication with an external computer
using EXCOM is approximately the same irrespective of if the actual controller is a transit node
or a slave node in the communication. The computer is always master.
Reflect the following when you read the load data at different transmission rates (bps) given in
figures below.
• The load algorithm is quite complex and the straight lines in the figures are practical
approximations only.
• Limit values for maximum number of messages (with a given number of signals in the
message) is given.
• A limit value within parenthesis is estimated.
• You should consider the individual signals included in a data set package in the same way
as AI-, AO-, DI-, DO-signals.
• To minimize the CPU load and to get high communication throughput you should apply
several signals in each message.
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0.6
0.4
0.2
12 24 36 48 60
Messages / sec
Load (%)
$2 signals / message
%4 signals / message
&8 signals / message
&
(30)
%
45
$
61