Publication 1756-UM514B-EN-P - February 2003
Using the Data Highway Plus Network 2-5
Application Guidelines
Consider the following application guidelines when configuring a
DH+ link for your system.
· Minimize the number of DH+ nodes to achieve acceptable
response times. Keep in mind the size and frequency of
messages exchanged between devices.
· Limit the number of stations on your network when you are
trying to achieve the fastest control response time. Establish
separate DH+ networks to bring-on additional stations.
· Do not add or remove stations from the network during
machine or process operation. If the network token resides with
a device that is removed, the token may be lost to the rest of the
network. The network is automatically reestablished, but it
could take several seconds. Control would be unreliable or
interrupted during this time.
· When possible, do not program controllers online during
machine or process operation. This could result in long bursts of
DH+ activity, increasing response time.
· When possible, add a separate DH+ link for programming
processors to keep effects of the programming terminal from the
process DH+ link.
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