The PWM Control board is a standalone board for controlling bi-directional proportional valves. Control up to 9ea bi-directional proportional and/or solenoid valves. 10ea analog inputs for pressure transducers / temperature transducers and 6ea digital inputs. All PWM outputs have two channels (A & B) for bi-directional valves, but A & B can also be driven individually at the same time for two onedirectional valves.