Allen-Bradley 1757-FFLD2, User Manual

Page: 46 / 184

46 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