Counter n B can control the direction of counting in edge counting applications. Use the A, B, and Z inputs to each counter when measuring quadrature encoders or measuring two pulse encoders.
Routing Signals to A, B, and Z Counter Inputs
Each counter has independent input selectors for each of the A, B, and Z inputs. Any of the following signals can be routed to each input:
Any PFI terminal
Analog Comparison Event
Routing Counter n Z Signal to an Output Terminal
You can route Counter n Z out to any PFI terminal.