Bus Load Calculation Up To 8,500 Meters - ABB S800 I/O User Manual

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The following example is for one I/O Station with: One CI810, 2 AI810s,
2 AO810s, 4 DI810s and 4 DO810s using 128ms cycle times for the AI and AO
modules; and using 64ms cycle times for the DI and DO modules.
@‘h€ƒyr)
AF100
(4 x 0.138%
Please refer to the
Fieldbus 100 load calculations and principals.
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For bus length 8,500 m (9,300 yards) use
AF 100 load must be equal to or less than 50%.
1 ms cycle time is not allowed.
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8’pyrÃ
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6D' 
۠
6D'(
16.60%
!
8.300%
#
4.150%
'
2.075%
%
1.038%
"!
0.519%
%#
0.259%
!'
0.130%
!$%
30
= 0.033% + (2 x 0.197%
%load Master
) + (4 x 0.146%
DI810
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6D'" 6P'
6D'!
6D'"$ 6P'(
11.80% 16.60% 16.63%
5.900% 8.300% 8.332%
2.950% 4.150% 4.182%
1.475% 2.075% 2.107%
0.738% 1.038% 1.070%
0.369% 0.519% 0.551%
0.184% 0.259% 0.292%
0.092% 0.130% 0.162%
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AI810
) = 1.972% Load
DO810
Table
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9D' Ã9D'
9D' #Ã9D'!

6P'! 9D'! Ã9D'"
9D'" Ã9D''$
9D'(
11.82% 8.40%
5.923% 4.200%
2.973% 2.100%
1.498% 1.050%
0.761% 0.525%
0.392% 0.263%
0.207% 0.131%
0.115% 0.066%
) + (2 x 0.221%
AO810
for complete details of Advant
3-6.
9P' 
9P' #
(1)
DP820
9P' $
INSCANT
9P'!
9P'!
9P'(
(2)
8.40% 16.60%
(2)
4.200% 8.300%
(2)
2.100% 4.150%
(2)
1.050% 2.075%
(2)
0.525% 1.038%
(2)
0.263% 0.519%
(2)
0.131% 0.259%
(2)
0.066% 0.130%
3BSE 020 925R101
) +
(1)
DP820
OUT-
SCANT
11.80%
5.900%
2.950%
1.475%
0.738%
0.369%
0.184%
0.092%