Problem of current drawing of digital entry into PCI-6220

We have card NI PCI-6220 mounted on card PCI-Raiser in a windows PC mini. We are using 8-channel digital input P1.4 - P1.7 and P2.2 - P2.5 to take a few entries of our entry card.

When the computer is turned on then everything works well and we get of the digital inputs in Labview. The problem is that when the computer is off the digital inputs on current drawing of early card PCI-6220 and due to this voltage regulator IC on our card entry begins to heat upward.

This problem occurs only when the PC is turned off, in a State that everything works fine.

We will be grateful can anyone suggest a solution to our problem.

Concerning

Magalie

I'm not familiar with this part OR special. But maybe there is protection on the output diodes. Usually, these diodes are connected since the entries on the power rail.

In case the power rail is 0V (or below the input voltage supplied in them), the LEDs will be put and feeding current in the power of the PC rail, attractive and current of your external device. If this unit has a push-pull, HIGH level output configuration there will be excessive current from the power supply where the outputs are short-circuit or almost short as it will be in the configuration described above.

I have no immediate solution except for additional hardware as the optocouplers, the outputs of your device from the inputs of the unit NOR the decoupling.

Tags: NI Hardware

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