ABB S800 - Page 130

PROFIBUS CI801 Section 3 Technical Data and Performance
130 3BSE015969-600 A
Calculation of Bus Cycle Time
How to calculate the Bus Cycle Time, see documentation for current master.
To calculate the Bus Cycle Time the following parameters for the I/O station shall
be used:
Number of input and output bytes. See Calculation of Number of S800 I/O Modules
per Station on page 126.
MAX T
SDR
Maximum Station Delay of Responder in T
BIT
(Bit Time). 
See GSD file.
DO890 6 1 1
DP820 12 18 13
DP840 10 34 0
Standard
Drives
4 13 12
Total sum - - - ParamSize InSize OutSize
Table 25. Calculation of Number of Modules on CI801 (Continued)
Module
Type
User
Parameters
Input
Bytes
Output
Bytes
Number
of
Modules
Sum
User Para-
meters
Sum
Input
Bytes
Sum
Output
Bytes