Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 256)

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11-8 Document: 553633
ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
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Refresh Timeout - Enter a value in the range 1 to 10000ms. This is the
maximum number of milliseconds allowed between successive refreshes of
input data before the data is declared invalid. Should the time be exceed and
the data declared invalid the input data will either retain the last received value
or revert to a fail-safe condition according to the Hold Last Valid Value setting.
The Refresh Timeout should be set to the longest delay before a fail-safe
action should be taken. This will be the Process Safety Time for the input data.
The corresponding Output board has a Refresh Interval parameter; this
controls how often data is sent to the Input board. The Refresh Interval
should be calculated to deliver at least two updates within the Refresh
Timeout, 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.
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Value in Failed State - Enter a value in the range -9.999999e+38 to
+9.999999e+38. This sets the control value to be adopted by the inputs when
the input has not been refreshed within Refresh Timeout and is therefore
declared invalid. Where the input corresponds to an integer the fractional part
if truncated. The value is always adopted at application start-up, though it will
not be used while the Hold Last Valid Value variable is TRUE.
The screen view below shows the configuration of a 16 channel analogue input board.
The board being configured is for Peer Network 4, source peer is Peer 4 and the
data block identity Board 3.