land-armor of NI 9209

Just a very basic / noob electronic issue specific to the Earth/shielding method of transmitting signals.

I use a module NI 9209 16 channels with connector D-SUB37 (in a slot of the cDAQ), I will use two cables armoured cables (so I'll use differential pins of I, and there is a "third wire" which is the shield around the two internal wires). These armoured cables and connector sub-d - NI9209 will be connected by a cable of Phoenix Contact (female-male-D-SUB37) and a Terminal screw distributor ( https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetailid = 2315191 & library = usen & tab = 1 # d... ).

The question is: should I connect my cable signal shielding wires (the shielding of signal cables are connected to the metal boxes of pressure sensors, so not on a spit of COM!) on the spit of land of the terminal screws, so for the shield of the cable D-SUB37? Also, should I sign this global network of shielding one of the pins of the NI9209 COM?

In this way the sensor, the sensor cables armoring cases and the shielding of the cable from the D-SUB37 so common and also connected to the pin of the NI9209 COM...

Is it good wiring, or should I only 'common good' armoring of the different cables, but not connecting them on the spindle of the DAQ hardware COM?

Usually until I just use simple BNC cables (only lead and wire shield as reference, while it was obvious how to connect to them). But now I have to deal with cables of signals with two sons of signals internal + armor.

Thank you!

Looks like you have a differential connection grounding, illustrated on page 13 of the startup guide 9209. I would try to start. In addition, I think remember that the c series modules use the mass of the cDAQ chassis which should have one leg on the side.

Tags: NI Software

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