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Configurable Flowmeter
Modules in a Local Chassis
CFM modules multicast their data periodically. Multicast frequency depends
on the options chosen during configuration and where in the control system
the module physically resides. The data consumer (an owner-controller) is
responsible for knowing that the format of the new data is integers.
Requested Packet Interval (RPI)
This configurable parameter instructs the module to multicast its channel and
status data to the local chassis backplane at specific time intervals.
The RPI instructs the module to multicast the current contents of its on-board
memory when the RPI expires, (that is, the module does not update its
channels prior to the multicast) as shown in this figure.
On-Board Memory
You set the RPI value during the initial module configuration and can
IMPORTANT
adjust it when the controller is in Program mode.
The minimum RPI is determined by channel usage. For each channel
using High Resolution Frequency mode, add 5 ms to the minimum RPI.
For each channel using Totalizer mode, add 50 ms to the minimum RPI.
For example, if one channel uses High Resolution Frequency mode and
the other goes unused, the minimum RPI = 5 ms. If one channel uses High
Resolution Frequency mode and the other uses Totalizer mode, the
minimum RPI = 55 ms.
Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Chapter 2
Configurable Flowmeter Operation in the ControlLogix System
Status Data
Flowmeter 0
Flowmeter 1
Ch 0
Ch 1
19
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