Rockwell Automation Publication CNET-UM001F-EN-P - February 2018 21
1. From the Network menu, choose Keeper Status.
2. Review the keeper devices on the Keeper Status dialog box.
On a typical network, the following must be true:
• There must be only one active valid keeper.
• All other keepers must be valid. If a keeper is not valid, it cannot
perform any scheduled communication. However, all unscheduled
communication occurs as expected.
• The keeper signature, shown in hex, must be the same for all
nodes.
When a ControlNet network is first established, it relies on a default set of
parameters capable of sending only unscheduled data. Default parameters in
all ControlNet devices include the following:
• Network Update Time (NUT) = 100 ms
• Scheduled Maximum Node Address (SMAX) = 1
The SMAX is the highest network address of a node that can use the
scheduled service.
• Unscheduled Maximum Node Address (UMAX) = 99
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