Rockwell Automation 1771-IFF/A,D17716.5.116 FAST ANALOG INPUT MODULE - Manual (Page 49)

Module Programming
5-5
Publication 1771Ć6.5.116 - July 1996
Scan time is defined as the amount of time it takes for the input
module to read the input channels and place new data into the data
buffer.
Word 24 of the block transfer write data table shows the scan time
for the module for the given configuration. These figures are the time
it takes to sample all channels and process the data. Refer to
Appendix A for tables showing common scan times at various
oversample rates.
Table 10.A
Scan Time in SingleĆEnded Mode
Number of
Oversamples
Word 24 Time (ms)
0 798 7.98
1 392 3.92
2 451 4.51
4 567 5.67
8 798 7.98
16 1260 12.60
32 2183 21.83
64 4028 40.28
128 7718 77.18
256 15100 151.00
Table 10.B
Scan Time in Differential Mode
Number of
Oversamples
Word 24 Time (ms)
0 402 4.02
1 199 1.99
2 229 2.29
4 287 2.87
8 402 4.02
16 634 6.34
32 1096 10.96
64 2018 20.18
128 3864 38.64
256 7554 75.54
Module Scan Time