Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 262)

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11-14 Document: 553633
ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
Configure Analogue Output Boards
1) Select the board.
2) Select the DXPAO16 tab.
3) Enter the following data.
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Refresh Interval - Enter a value in the range 0 - 10000ms. This is the
maximum time allowed between transmissions of the output data.
Note: Data will be sent immediately following any change of output state. If a value
of zero is specified in this field then data will be refreshed every application scan
regardless of output state change.
The Refresh Interval should be calculated to deliver at least two updates within the Refresh
Timeout of the corresponding Input board, under worst case conditions. A Refresh
Timeout which is too short for the network size and complexity will make it impossible to
deliver fresh data often enough.
The setting for the Refresh Interval should be less than:
(Input board Refresh Timeout - Worst case Delivery Delay) / 2
The Worst Case Delivery Delay is:
Refresh Timeout (on DXPNC40 control board) + Scan time of this controller + Scan
time of receiving controller + 50ms

Minimum Change before Update - Enter a value in the range 0 to
9.999999e+038. This value sets the minimum change in any output variable
before the update is sent to the Peer input board (excluding any refresh
interval). When applied to integers the fractional part is truncated.