Schedule The Network - Rockwell Automation Allen-Bradley ControlNet 1734-ACNR User Manual

B-6 ControlNet Overview
Publication CNET-UM001C-EN-P - November 2005
Table B.2 NUT Example Data Rates
With this NUT
5ms
In our example, if you specify an RPI of 25ms, then the network produces an
API of 20ms, which is the next fastest rate at which the module can send data.
The module places the data on the network at every fourth network update
interval to produce the 20ms API. Similarly, if you specify an RPI of 150ms,
the network produces an API of 80ms.

Schedule the Network

Connections over ControlNet can be:
• scheduled - data transfers occur at specific times
or
• unscheduled - data transfers occur when the network can accommodate
the transfer
To use scheduled connections, you must schedule the ControlNet network via
RSNetWorx for ControlNet software. For more information on how to
schedule a ControlNet network with RSNetWorx for ControlNet software, see
the section Use RSNetWorx for ControlNet Software.
You must use RSNetWorx for ControlNet software to enable any connection
in a remote chassis. In addition, RSNetWorx software transfers configuration
information for the remote modules, verifies and saves NUT and other
user-specified network parameters, and establishes a schedule that is compliant
with the RPIs and other connection options specified for each module.
RSNetWorx software must be run whenever a scheduled
IMPORTANT
connection is added to, removed from, or changed in your
system.
And this multiple
1
2
4
8
16
32
64
128
The Module Can Send
Data at this Rate
5ms
10ms
20ms
40ms
80ms
160ms
320ms
640ms