Rockwell Automation Publication 1794-IN099D-EN-P - November 2018 15
FLEX I/O DeviceNet Adapter Module
• Input data issue in firmware revision 2.004
• In firmware revision 2.003 or earlier, the 32-point I/O modules would
have only one input word and one output word allocated in the default
out-of-the-box mode of operation for each 32-point module.
If You Replace Firmware Revision 2.003 or Earlier Adapter With 1794-ADN
Series C
Take the following precautions when replacing a firmware revision 2.003 or
earlier adapter with a firmware revision 3.001 or later adapter when the FLEX
rail contains any 32-point modules.
• If out-of-the-box mode was used with the original adapter, the 32-point
modules were configured to act as if they were 16-point modules. After
changing to the firmware revision 3.001 adapter, it will not make a
connection with the scanner because there will be a mismatch in the I/O
sizes. The scanner will report an error 77, indicating the I/O size
mismatch between the scanner and adapter.
To resolve this I/O size mismatch, two changes must be made:
– The scan list of the scanner must be updated to reflect the new I/O
size of the adapter.
In the case of each 1794-IB32 module, an extra input word must be
added and the output word deleted. Similarly with each 1794-OB32
module, an extra output word must be added and the input
word deleted.
– After the scan list of the scanner has been updated to reflect the new
I/O sizes, the I/O image of the controller will have to be adjusted,
along with the ladder program of the controller, for any I/O that has
shifted due to I/O image changes.
• If out-of-the-box mode was not used, and an RSNetWorx™ software-
based configuration was downloaded to the original adapter, there are
two cases to consider:
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