Rockwell Automation 1734-ACNR POINT I/O ControlNet Adapter User Manual - Manual (Page 30)

Publication 1734-UM008B-EN-P - August 2005
3-10 Plan to Use Your Adapter
When using I/O modules with large amounts of data, be aware of the
1734-ACNR adapter data capability. The 1734-ACNR adapter has 586
bytes of memory available for scheduled transmit data. The amount of
data used by an individual connection must also include a small
amount of overhead - 10 bytes per connection. Use the following
formula to track the amount of available scheduled transmit data.
Available Memory =
586 - [(Number of connections * 10) + Sum of all connection sizes]
In the following examples, the system uses a 1734-ACNR adapter with
five 1734-232ASC modules.
In this example, you could add a sixth module if it uses less than 54
bytes of application data with 64 bytes of memory left.
64 = 586 - [(5 * 10) +472]
Application Data Size
(Number of Bytes) Memory Required
1734-232ASC - 1 100 110
1734-232ASC - 2 88 98
1734-232ASC - 3 96 106
1734-232ASC - 4 96 106
1734-232ASC - 5 92 102
Total Bytes Used 472 522