ABB S800 - Page 140

S800 I/O Station Data Scanning Section 3 Technical Data and Performance
140 3BSE015969-600 A
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 => 1*1.40 ms = 1.40
2 AO810/AO810V2 => 2*1.20 ms = 2.40
3 DI810 => 3*0.43 ms = 1.29
2 AI810 => 2*3.00 ms = 6.00
3 DO810 => 2*0.43 ms = 1.29
2 AI830/AI830A => 2*0.40 ms = 0.80
1 DP820 => 1*1.72 ms = 1.72
-------------------------------------------------------------
14.9 ms
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.
Standard drives 0.71 0.86 - -
FCI CI801 1.18 - - -
FCI CI810 - 1.40 - -
FCI CI820 redundant - 1.40 - -
FCI CI840 - - 2.10
Table 28. I/O Scan Cycle Time in the FCI (Continued)
Module Type
Execution Time Used in ms
CI801
CI810,
CI820
CI840
Single I/O
Redundant
I/O pair