60
Digital I/O
Activating an Air Valve
Let’s say you want to control an air valve for equipment that will automatically stamp “tested
good” on each assembly that passes a test. In the User Preference
Set Digital Output
, you can
select
Cable Counted Good
to both set and reset the output.
Remember, if the same event is
selected for set and reset, the tester will sink the output for a 10-millisecond pulse. In this case, a
pulse is all we need to make our stamp mechanism function.
In the example below, the solenoid for the air piston requires VDC 24 and 300 milliamps (the coil
resistance is 80 ohms).
Note:
The digital I/O port can only supply 100 milliamps at either VDC 5 or 10; however, the
output can sink up to 24 VDC. In this case, you can use an external power supply for the valve
circuit as shown below.
Pin 5
Output
Pins 14 & 15
Ground
Valve
Solinoid
DC Power
Supply
+24 V
Diode
In this example, a 1N4002 is added across the relay to protect the digital I/O port from the
reverse current created from the coil when the output turns off.
Summary of Contents for 1100R+
Page 1: ...Version 2011 1 0 November 10 2011 1100R User s Manual...
Page 28: ...24 Using the Tester...
Page 78: ...Connections continued Net Test Points Components...
Page 79: ...Notes...
