Allen-Bradley 1771-CFM Configurable Flow Meter Module - PLC-5 By wayne No Comments on Allen-Bradley 1771-CFM Configurable Flow Meter Module - PLC-5 2 Min Read The Allen-Bradley 1771-CFM configurable flow meter module delivers 4 digital I/O and 100 kHz input for turbine flowmeters. It directly replaces 1771-QRC units.