Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 133)

Application Examples E–17
Publication 2755-6.9
The DTAM Plus DeviceNet supports the polled I/O method of
exchanging data with a master, in the following sequence:
1. The designated master writes an output image to the DTAM Plus
DeviceNet using the Poll Command message.
2. The DTAM Plus DeviceNet responds to the poll command by
returning an input image back to the master in a Poll Response
message.
Note: The size of the input and output images (also referred to as
files) are individually configurable from 0 words to 121 words
each, to optimize DeviceNet network loading.
3. The DTAM Plus DeviceNet application program interacts with
data contained in the input and output files.
4. Data Display screens are used to view input and output data.
5. Data Entry screens are used to modify input and output data from
the reader.