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Fieldbus Communications Support
890USE19600 April 2004 37
Data Length The following table shows the relationship between the actual data length of the
island and the length of the code on INTERBUS. The actual data length (anywhere
from 0 to 16 words) represents the greater of the input or output data length.
Actual Length of Island Data INTERBUS Data Length Data Length Code (Hex)
up to 1 word* 1 word 1
2 words 2 words 2
3 words 3 words 3
4 words 4 words 4
5 words 5 words 5
6 words 6 words E
7 words 7 words F
8 words 8 words 6
9 words 9 words 7
10 words 10 words 15
11 to 12 words 12 words 16
13 to 14 words 14 words 17
15 to 16 words 16 words 12
17 to 24 words** 24 words 13
25 to 26 words** 26 words 11
* The status word is included in the data length, so the minimum allowable data length for an Advantys island is 2
words (data word + status word).
** The STB NIB 1010 INTERBUS NIM supports only up to 16 words in each direction (input/output).