ABB S800, Product Manual

Page: 122 / 186

Table 21. % of load on the Advant Fieldbus 100 by S800 I/O (up to 2000 m Bus Length)
Cycle
Time
(ms)
Module Type
AI801
AI810
AI890
AI895
AI820
AI830
AI830A
AI835
AO801
AO810
AO810V2
AO890
AO895
AO820
DI801, DI802
DI803, DI810

DI811, DI814

DI820, DI821

DI830, DI831

DI885, DI890
DO801
(1)
, DO802
DO810
(1)
(1) Readbacks increase the load depending on the cyclicity and with the same amount as the net load at the cycle time.
For Master the cycle time is 1024 which gives 0.009% more load. For MOD the cycle time is configurable.
, DO814
(1)
,
DO815
(1)
, DO820
(1)
,
DO821
(1)
, DO890
(1)
1 25.2% 15.6% 25.3% 25.23% 15.62% 8.8% 8.8% 25.2% 15.6%
2
12.6% 7.8% 12.6% 12.63% 7.815% 4.4% 4.4% 12.6% 7.8%
4 6.3% 3.9% 6.3% 6.325% 3.915% 2.2% 2.2% 6.3% 3.9%
8
3.15% 1.95% 3.15% 3.175% 1.965% 1.1% 1.1% 3.15% 1.95%
16 1.575% 0.975% 1.575% 1.6% 0.99% 0.55% 0.55% 1.575% 0.975%
32
0.788% 0.488% 0.788% 0.812% 0.503% 0.275% 0.275% 0.788% 0.488%
64 0.394% 0.244% 0.394% 0.418% 0.259% 0.138% 0.138% 0.394% 0.244%
128
0.197% 0.122% 0.197% 0.221% 0.137% 0.069% 0.069% 0.197% 0.122%
256 0.098% 0.061% 0.098% 0.123% 0.076% 0.034% 0.034% 0.098% 0.061%
512
0.049% 0.03% 0.049% 0.074% 0.046% 0.017% 0.017% 0.049% 0.030%
1024 0.025% 0.015% 0.025% 0.049% 0.03% 0.009% 0.009% 0.025% 0.015%
2048
0.012% 0.008% 0.012% 0.037% 0.023% 0.004% 0.004% 0.012% 0.008%
4096 0.006% 0.004% 0.006% 0.031% 0.019% 0.002% 0.002% 0.006% 0.004%
Advant Fieldbus 100 Load Section 3 Technical Data and Performance
122 3BSE015969-600 A
DP820
(2)

INSCANT
(2) Total load = (load generated by INSCANT) + (load generated by OUTSCANT)

The total load if INSCANT is 32 ms and OUTSCANT is 64 ms is:

Total load = 0.788 + 0.244 = 1.032%
DP820
(2)
OUT-
SCANT