Keithley 7706 20 channel universal i o plug in module keithley 7706 p the keithley 7706 is a 20 channel universal i o plug in module the module offers 20 channels of 2 pole or 10 channels of 4 pole multiplexer switching with automatic cjc it has two analogue output channels 16 digital outputs and one event counter p p the event counter can be used to monitor and control system components such as fixtures limit switches pass fail indicators external voltage sources loads door cl