ABB S800 Product Manual page 140

S800 I/O Station Data Scanning
Standard drives
FCI CI801
FCI CI810
FCI CI820 redundant
FCI CI840
Analog modules will be scanned every fourth I/O scan cycle time except for
AI830/AI830A, AI835, AI843 and AI893 modules which will be scanned every
tenth time.
DI and DO modules will be scanned each I/O scan cycle time.
For example, a non-redundant station with a CI810A, two AO810/AO810V2,
three DI810, two AI810, three DO810, two AI830/AI830A and one DP820 will
give the following I/O scan cycle time:
1 CI810A =>
2 AO810/AO810V2 => 2*1.20 ms =
3 DI810 =>
2 AI810 =>
3 DO810 =>
2 AI830/AI830A =>
1 DP820 =>
-------------------------------------------------------------
14.9 ms is not a multiple of 2, so an increase of the value to the nearest multiple of 2
gives 16 ms.
CI810A/CI810B compensation 1.25*16 ms=20 ms.
140
Table 28. I/O Scan Cycle Time in the FCI (Continued)
Module Type
1*1.40 ms =
3*0.43 ms =
2*3.00 ms =
2*0.43 ms =
2*0.40 ms =
1*1.72 ms =
Section 3 Technical Data and Performance
Execution Time Used in ms
CI810,
CI801
CI820
Single I/O
0.71 0.86
1.18 -
- 1.40
- 1.40
- -
1.40
2.40
1.29
6.00
1.29
0.80
1.72
14.9 ms
CI840
Redundant
I/O pair
- -
- -
- -
- -
2.10
3BSE015969-600 A