Rockwell Automation 198 Series C Modular DeviceNet Starter Auxiliary User Manual - Manual (Page 153)

DeviceNet Information A-19
Publication 198-UM002A-EN-P December 2001
Nibble-wise Input (Produced) Assemblies
Instance 101
This input (produced) assembly was included in the Series B MDSA. Its length (in bytes) can
be calculated as follows:
(I/O module + 1 + (no. of IB2XOB2S modules) / 2) + 5
Unlike the “Byte-wise” output assemblies whose “location” bits operate as a binary location
count, the above “Nibble-wise” assembly contains a single location bit for each possible
module. The error location is simply given by setting the corresponding bit, rather than
generating a binary coded module number.
Custom Parameter Based “Word-wise” I/O Assemblies
The contents of these assemblies are determined by contents of the “Assembly Word X”
parameters in the EDS files.
Table A.28 Instance 100 — Nibble-wise Output Assembly Instance
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Module 2 data Module 2 data
1 Module 4 data Module 4 data
: : :
: : :
N/2
Table A.29 Instance 101 — Nibble-wise Input Assembly Instance
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Status 8 Status 7 Status 6 Status 5 Status 4 Status 3 Status 2 Status 1
1 Status 16 Status 15 Status 14 Status 13 Status 12 Status 11 Status 10 Status 9
2 Location 8 Location 7 Location 6 Location 5 Location 4 Location 3 Location 2 Location 1
3 Location 16 Location 15 Location 14 Location 13 Location 12 Location 11 Location 10 Location 9
4 Error code
5 Module 2 data Module 1 data
6 Module 4 data Module 3 data
: : :
: : :
(N+5)/2