Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual - Manual (Page 141)

Publication 1756-UM534B-EN-P - November 2010 141
Appendix
B
Adapter Mode I/O Map
This section describes the remote I/O data that gets mapped to the
ControlLogix data for adapter mode.
The structures that get mapped for adapter mode are similar to those for
scanner mode, with the exception of the control bits. In adapter mode, you
have no control over when racks or block transfers update.
The I/O data can be remote I/O input or output data on monitored or active
racks.
Discrete Data Discrete Input Data
In adapter mode, the discrete input structure for a rack consists of two status
words followed by eight words of discrete input data. When you map any part
of a rack to produced/consumed tag data, the structure that gets mapped is for
the entire rack number.
Discrete Input Monitored Racks
Inputs on monitored racks are mapped to ControlLogix inputs.
Only bits 0…3 of the first word of status data are used. They consist of error
bits that are set if there is a communication error with a partial rack. Bit 0
corresponds to a rack that starts at I/O group 0; bit 1 corresponds to a rack
that starts at I/O group 2, and so on.
The bit is set if there is an error scanning the rack and is 0 otherwise.
0 1 2 3 4 5 6 7 8 9
8 Words of Discrete Input Data
Only
First 3
Bits Used
1st
Status
Word
2nd
Status
Word
Not
Used
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