Data Scanning - ABB S800 I/O User Manual

"! # 9h‡hÃTphvt
The ModuleBus data is scanned (read or written) cyclically, depending on the I/O
module configuration. To calculate the I/O scan cycle time in the FCI do as follows:
Totalize (number of module type x) * (used execution time for type x)
(see Table
the I/O scan cycle time. If CI810A is used the scan cycle time is increased by 25%
and to the nearest higher multiple of 2.
.
AI810, AI890
AI820
AI830, AI835
AO810, AO890
AO820
DI810, DI811, DI814, DI820, DI821, DI830,
DI831, DI885, DI890
DO810, DO814, DO815, DO820, DO821,
DO890
DP820
FCI CI810
FCI CI820 redundant
Analog modules will be scanned every fourth I/O scan cycle time except for AI830
and AI835 modules which will be scanned every tenth time.
DI and DO modules will be scanned each I/O scan cycle time.
3BSE 020 925R101
Avryqiˆ†Ã8‚€€ˆvph‡v‚ÃD‡r…shprÃs‚…Ã6q‰h‡ÃAvryqiˆ†Ã
3-8) and increase the total value to the nearest higher multiple of 2 to get
Table 3-8. I/O Scan Cycle Time in the FCI
H‚qˆyrÃU’ƒr
Trp‡v‚Ã"! 6q‰h‡ÃAvryqiˆ†
Ã@‘rpˆ‡v‚ÃUv€rÃV†rqÃvÃ€†
TvtyrÃA8D
3.00
1.50
0.40
1.20
0.60
0.43
0.43
1.72
1.40
-
ÃV†r…¶†ÃBˆvqr
ÃG‚hqvt
Srqˆqh‡ÃA8D
4.5
2.25
0.6
1.8
0.9
0.65
0.65
2.16
-
2.1
33