PXI 2564 how to

I am trying to power a solenoid valve that needs 24V supply. I have a PXI 2564 slot which I am planning on using to supply the voltage and then turn it off (or relay) when I want the valve opened and closed. My question is to how I am supposed to (or how it is conventionally done) connect everything. I was planning on getting the 37 pin dsub connector to pin connector piece (shown in the link). Would I then just need to buy a 24V DC power supply and strip the output wires and put them into 2 of the pins on the connector? Also, is there any way to monitor/change current and voltage or does the 2564 simply just relay??
http://sine.ni.com/nips/cds/view/p/lang/en/nid/210164

Hi lvuser333,
Conceptually, what you are saying seems correct. You will have to be careful with the Dsub connector you choose. Not all of them are rated to withstand 24V, but the one you linked should be compatible with your application, assuming you aren't pushing more than 5A through it.
What do you mean by strip the two output lines?
It should be fairly simple. For instance, you could feed 24V to Channel 0 and connect your solenoid to COM 0. Then, when the switch closes the connection, you are powered on, and when it opens, you are powered off. A module like the PXI-4142 would likely be suitable for you.
I am not sure I understand your last question. The 2564 is simply a relay card, but you can modify what power is output by the power module.
I hope this helps.
Best Regards,
Thomas B.
National Instruments
Applications Engineer

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Where i can find exemples for PXI-2564 relay module

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I have try to access it using "visa connect" and this step works, but what must i do to go further.
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Can you give me some exemple or trick?
Best regards

Hello,
What software do you use? what version?
Have you look into the LabVIEW Example Research with KeyWord "Relay". There are examples with NI-DAQmx and niSwitch drivers.
Thanks
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National Instruments France

PXI-2564 RLP

I'm trying to find RLP information for the PXI-2564 and PXI-2570 relay cards, can someone point me in the right direction?
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Thanks

Johnbull,
The short answers is yes, but due to its ability to potentially damage the hardware if used incorrectly we generally try to keep this as internal as possible.
Normally we would suggest you to attempt to use Linux NI-DAQmx 8.0.2 to program your device [as both the 2564 and 2570 are supported]. There may be some changes you might need to make in the installer as this is designed for Red Hat Enterprise Linux WS 4 but this has been done by many others in the past.
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Can the NI PXI-2564 handle 115Vac 400Hz max current 4 amps?

RFB-AIS,
My apologies, on further examination, it turns out you should be all set. The maximum relay operate time is not actually associated with the frequency of your signal. The important characteristics are the switching current and voltage, and combined power, which a"must not exceed 30 W at 150 VDC, 150 W at 30 VDC, or 150 VAC, 5 A" according to the product manual--http://www.ni.com/pdf/manuals/373963h.pdf
All of your signal characteristics satisfy those requirements, and you shouldn't have any issues operating at 400 Hz.

PXI-7854R: how many times can bitfile be loaded to FPGA?

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B Spears,
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Hi,
Is there any way to control the rise time in the PXIe-6556 digital lines?
Even in a low frequency signal 10kHz the rise time is about 2ns.
Tks,
Solved!
Go to Solution.

Hello engfpe,
The PXIe-6556 is a 50 Ohm system, meaning the output is source series terminated to be 50 Ohms and all our cables and accessories are 50 Ohms. With this setup regardless of the data rate you should have a clean rising or falling edge regardless of the data rate. The quality of the output (rising or falling edge) at your device will be related to the impedance matching of your cables.
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You can see in the attached images you can significantly slow down the edge with this setup by altering C1. I hope this helps,
Jesse O. | National Instruments R&D
Attachments:
edge_compare_schematic.jpg ‏94 KB
edge_compare_waveform.jpg ‏44 KB

How to connect to PXI 1042 chassis from PC

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You would require a MXI link to do that.
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In general stand alone instrument ther is a provision to measure CNR parameter. But using NI PXI 5660 how we can find out CNR?

Hello MVK,
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Hope im clear enough.
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Hello,
The remote connection you use to talk to your PXI chassis should not affect your VISA programming. More specifically, a PXI serial interface should show up as a COM port, and you can use VISA to communicate with it via its resource name (usually an alias such as COM2). How you use VISA will depend on your choice for development platform. For example, in LabVIEW you could use VISA Configure Serial Port.vi along with VISA Write, VISA Read, and VISA Close functions. You may also use a property node for more advanced features. In any event, if you repost with your choice of development environment, I can likely point you to an example you can use to get more comfortable.
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Health signals of PXI?

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Power control switch for 115VAC wall outlet to operate resistance heating element.

I am very new to LabView software as well as hardware
interfacing, so don't presume that I know anything. My problem seems
simple, I want to be able to control and automate via LabView software a resistance
heating element that can plug into a standard 115VAC wall outlet. I
searched through the Knowledge Base and found this comment:
http://digital.ni.com/public.nsf/allkb/855AF9CBDAACE3018625725A00638653
The PXI 2564 seemed ideal but I have no clue how to connect the serial port to
my heating element, or even if this is enough current (5A, do heating elements
need a certain wattage?) I had originally envisioned a simple surge
protector like device that had computer control options. Many devices
like this are available, however all the ones I have found are web-accessed via IP address
and I am unsure how to interface this type of device with LabView if it has its
own GUI. Obviously I have no idea what I am doing here so any help would
be much appreciated. The heating element requires 115VAC or DC it does
not matter, and all I need to do is turn the power on and off, no variance is
required, although that could be very useful. I have implemented a NI
CompactDAQ for other control and measurement (24VDC Digital I/O and Thermocouple) if this
could somehow play into my solution, but I believe the limits on voltage for
this device are much lower. Thanks!

Hi Anfu,
LabVIEW gives you the power to control and automate all National Instruments hardware using NI drivers (i.e. NI-DAQmx).  I have a couple of NI hardware suggestions, but it's up to you to decide on the hardware that will best fit your application. Even if you end up using third-party hardware, I think you will find LabVIEW is a great interface to control and/or automate your hardware.
The resistance heating element you want to control...you state it is powered via wall voltage, but you did not state the required current. This is important information you should be able to find in the heating element's data sheet. The amount of current you need at 115 VAC (or DC) will determine your desired relay characteristics. Once you know the voltage and current (or power) the heating element requires, you can calculate the hardware specifications that are necessary for your application - and can confidently select the correct hardware.
Starting from the fact you need to switch wall voltage, you will want a switch rated for Measurement Category II (CAT II). This classification ensures you will be kept safe from the high voltages being switched.  National Instruments has PXI hardware that can switch wall voltages, as you mentioned previously, and one of these switches is the PXI-2564.  Your computer would communicate with the PXI-2564 through its PCI bus, not its serial port. Several methods to connect your PCI bus to PXI is to purchase a MXI-4 card (this would fit in one of your computer's PCI slots) that cables to a PXI chassis (in which the PXI-2564 is located). Also, you can purchase an embedded PXI controller (then you wouldn't need a separate computer, as the embedded PXI controller houses a laptop-like computer). In total, you would need a PXI-2564, a PXI chassis, and either a MXI-4 or embedded PXI controller.
If PXI doesn't seem ideal, instead you could create a Plug-and-Play (PnP) SCXI system!  First, choose a SCXI switch module (such as a SCXI-1127). Then, you can purchase a USB-1357 to control the SCXI-1127 module from one of your computer's USB slots. In total, you would need a SCXI-1127 module, a 4-slot SCXI chassis, and a USB-1357.
Another option is the SCXI-1161. Unfortunately, the USB-1357 doesn't connect to the rear of the SCXI-1161, but there is there are two additional options available for controlling the SCXI-1161. One is to purchase a PCI DAQ module (or use one if you already have one) and connect it to the SCXI-1161 using the SCXI-1349. The other is to purchase a SCXI-1600 (which is a DAQ board, SCXI form factor) that you control via USB. In total, you would need a SCXI-1161, a 4-slot SCXI chassis, and a SCXI-1600 or a DAQ board and a SCXI-1349.
Either way, the PXI and SCXI options both give you the full functionality of a modular, LabVIEW-controlled switch. Upon purchasing the switch module, you also get the required drivers, getting-started and troubleshooting tools (such as the NI-SWITCH Soft Front Panel), and examples to get you up and running quickly.
In reference to the simple surge protector like device that has computer control options - I'm sure someone from the LabVIEW forum could assist you in communicating to one of these devices via the web. Don't worry, if the device can be controlled via the web, you're good to go.
Lastly, in response to your final statements, it is important to find out how much current or power the heating element requires because that will directly determine your required switch hardware specifications. You mention no variance is required, which is good, because the switch will simply turn on or off the power to the heating element. I agree a NI CompactDAQ option could be very useful for an application such as this, however there are no CAT II relay or switch modules for this form factor at this time.
Hope this helps!
Chad Erickson
Switch Product Support Engineer
NI - USA

Solenoid valve baseline

Hi, I know there is a lot of info on solenoid valves on the forums, but I am looking to establish myself a starting point. I need a solenoid valve (or any valve that can be controlled, really) that will allow me to open and close the valve fairly rapidly (less than 1 second) so I can control the level of liquid in a container. There will constantly be liquid on one side (the top side of the valve when in vertical position), and the valve will open for a short amount of time until a few mL are dispensed and then close. I read alot about needing a DAQ or a relay board, but is there anything out there that I can just plug into the wall to power and then have a usb or other wire run to my PXI to easily open and close it? I have PXI card slots 4130,2564,8232,4065,8101.
For example, could I just use something like the coleparmer valve below and just supply 24V from the PXI 4130 to open it and then remove voltage to close it?
http://www.coleparmer.com/Product/Cole_Parmer_Low_Flow_Direct_Lift_Proportioning_Solenoid_Valve_0_02...
http://www.grainger.com/Grainger/RED-HAT-Solenoid-Valve-6WTP4?Pid=search
Solved!
Go to Solution.

The PXI-4130 is capable of sourcing 20V at 2 amp which should be more than adequate to drive the valve (the current requirements are missing from the spec sheet on the website) but it's kind of like bringing a bazooka to a fist fight. The PXI-2564 is better suited becuase its' a simple bank of contacts but you will need an external 24 V supply.
Going USB could add a whole other layer of complexity depending on the device driver. If you have labview and access to the hardware you listed then this type of application is relatively simple to create.
Here is a great article on implementing a closed loop on/off controller: https://decibel.ni.com/content/docs/DOC-16199.
And to answer your orignal question...yes, solenoids usually work as you described - apply power to open, remove it to close.
Philip
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Best way to synchronize multiple FPGAs

I have multiple PXI-7833R FPGAs and I need all of the AIs to be sampled at the same times (across all FPGAs). As I sample all of the individual AI channels, I buffer the data (write to DMA), scan it and check for a user defined trigger in a different loop. Once I discover this in one channel, I save the data from all FPGAs. In terms of synchronizing the sampling, I had begun, from one FPGA, to send a signal over the PXI trigger line to tell the others to sample, but I assume this does not guarantee synchronization. If I base all of the separate FPGA VIs off of the PXI clock, how do I synchronize the loops to sample at the same clock times?
Thanks
Solved!
Go to Solution.

Hi,
Well, if it's not very timecritical you could pass messages through the host, thats right.
Another way, which is quite hard to implement though, would be to use the other available pxi trigger lines to send messages directly from one FPGA to the other. You would need something like a handshaking, a kind of master who directs which slave is allowed to send, a kind of clock for synchronization and so on.
I cannot give you detailed information, since I never did that by myself, but I know other projects where this works quite good.
Maybe another forums user can give you some better advice.
Thanks,
Christian

PXI 2564 how to

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