Rockwell Automation 1757-FFLDC4 FOUNDATION Fieldbus System User Manual User Manual
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Rockwell Automation Publication 1757-UM012A-EN-P - July 2011
Chapter 3
Create an RSFieldbus Software Project
Set the Stale Count
Stale count is the number of macrocycles that elapse before a signal is sent to
indicate there has been no update of the link data.
Do these steps to change the stale count.
1.
In the Process Cell window, right-click the control module icon and
choose Attributes.
The Control Module dialog box appears.
2.
Enter a stale count value and click OK.
The Control Module is added to your configuration.
Table 1 - Stale Count Examples
Macrocyle
Stale Count
Delay Before a Link Failure is Indicated via the Input
Fault Bit or Quality/Status Data
200 ms
10
2 s
1000 ms
10
(1)
(1) A more appropriate stale count for this example may be 3 or 4 seconds depending on the
application requirements.
10 s
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