Rockwell Automation 198 Series C Modular DeviceNet Starter Auxiliary User Manual - Manual (Page 150)

A-16 DeviceNet Information
Publication 198-UM002A-EN-P December 2001
Instance 107
This is the default input (produced) assembly for the Cat. No. 198-DN. It was included in the
Series B MDSA as the default produced assembly. It is 20 bytes long (the MDSA can
accommodate 16 I/O modules, plus 4 bytes of status). It has the following format:
I/O Modules and “Nibble-wise” I/O Assemblies
When “Nibble-wise” assemblies are chosen, each I/O Module on an MDSA back-plane will
contribute 1 nibble (4 bits) of data to the assembly data. The “nibble-wise position” within
the assembly is dependent upon the I/O module position on the back-plane. The I/O
module that is physically closest to the DeviceNet Module appears at the lowest “nibble-wise
position” within each assembly. These assemblies were originally defined for Series B MDSAs
as a way to reduce the size of the assemblies, and thus reduce network traffic and conserve
scanner-mapping space.
Table A.23 Instance 107 — Default Input Assembly Instance for Cat. No. 198-DN
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 7 Location 6 Location 5 Location 4 Location 3 Location 2 Location 1 Location 0
3 Error 7 Error 6 Error 5 Error 4 Error 3 Error 2 Error 1 Error 0
4 Module 1 data
5 Module 2 data
6 Module 3 data
7 Module 4 data
8 Module 5 data
9 Module 6 data
10 Module 7 data
11 Module 8 data
12 Module 9 data
13 Module 10 data
14 Module 11 data
15 Module 12 data
16 Module 13 data
17 Module 14 data
18 Module 15 data
19 Module 16 data