Instance 107, I/o modules and “nibble-wise” i/o assemblies – Rockwell Automation 198 Series C Modular DeviceNet Starter Auxiliary User Manual User Manual
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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