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NI 9375 DI COM pin connected to earth ground?

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Hi, I would use a NI 9375 to check the state of some digital swithces, in a circuit with a +24V power supply. Inside the 9375 the lower end of the receiver circuitry (DI COM) is connected to GND, but it is isolated from earth ground as stated in the manual.

Our +24V power supply has the "minus" pin connected to earth ground, and will be connected to DI COM..

Is there any problem for this connection? 

Thank you in advance

 

Temistocle


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