I/o current or voltage check with the switching matrix

Hi all

I want to use a switching matrix to test current and voltage of a control cabinet. For this, I have a voltage of the injector, injector current, a voltage measurement and measurement of currents from one side of the matrix (side line) and a 20 lines by I / O test. Is there a way to check (with a hardware or software solution) that we are ready for a test voltage or current in automatic mode.
The ideal would be to have a physical key indicating that we are testing the right card, but if the operator uses the wrong card, I would check it is not injected + 24V-on entry to an entry card 0-20mA current.

I wish you turns me on!

Best regards

Vincent

Vincent,

Some approaches for you to consider:

1 Add a resistor or a few resistors to each card.  Measure the resistance before applying all power to the i/o lines.  The code of the resistance (s) to identify the class of Council (current or voltage) and rank (if applicable).  Simple jumper on the unused pins of the connector can also be used.

2 measure the input impedance (or at least the resistive component) before turning the power on.  An input voltage device probably has a high input impedance while the current input device has a low input impedance. It could detect and reject some devices with resistance to entry incorrect installed.

3. use a camera to determine which device is connected.  (This should satisfy your request to be informed!)

4. you can replace the operator with a robot, but the robot would still need to use something like 1, 2 or 3 to identify the boards.

5. use edge configurations physically incompatible connectors/card so that the cannobe Board connected to the tester bad.

Lynn

Tags: NI Hardware

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