Allen-Bradley ControlLogix Ethernet Driver Help
Note: It appears that Logical Blocking is most optimal for the given application.
Optimizing Channel Communications
Channel communications can be optimized by moving tags for Logical Blocking in one device and tags for Logical Non-Blocking in another. This is called tag division.
Logical Blocking (Device 1) ProcessPID OverflowCounter
Logical Non-Blocking (Device 2) FlowRate ValveOpen InProcess Tank Volume