Upto 10 on/off digital inputs can be connected which can be set to produce a proportional 0 to 10vdc output in response to how many inputs are eneregised.
Typical example applications are
1.) to match a common fresh air intake fan speed or fresh air intake damper motor position to the number of A/C units in operation.
2.) to match fresh air supply fan speed to match number of kitchen exhaust fans running.
Also see our new related product AWEC as an accessary AUTO/MANUAL speed selector module