CRIO using to publish to cDAQ DAQ?

All,

I worked on the integration of cRIO DAQ (9073) (2) existing environmental testing rooms and next to improve resolution of acquisition data and controllability. My plan of material NOT included installation a cRIO-9073 in an enclosure behind each room with cable for TC/4-20mA/RTD DAQ cross led in the room of the TEU. Two of these cRIOs will host code RT publish their data on a LAN. In the control room for the rooms, there are two PC which is BOTH be querying the network for all data from these TWO cRIOs. In this way, operators can choose either PC for both rooms at any time.

Now for my problem. It was requested that buy us cDAQ-9171 (USB) or a cDAQ-9181 (Ethernet) and to install one in each room. These single module Renault each contain a 16 TC (NI 9214) card. The reason for this is to save money (we will save a bunch of TC wire and connectors when installing this single DAQ modue very close of the TEU). However, what I need to know, is whether or not these products can publish temperature data on the network without direct connection to a PC. My research leads me to believe that they can not do it alone, but the specifications of the cDAQ-9171 (USB) declare that the operating system/target can be either Windows or real-time. Does this mean that I can connect the cDAQ for the cRIO and include the RT code on the cRIO to publish the data of the cDAQ to the network at a constant rate?

Ideally, we wanted to buy the cDAQ-9181 (ethernet) and simply connect it to the LAN as a standalone device, but I don't think he is capable of running RT code to publish its own data on the network at a constant speed without connecting to a PC. is this true or am I misunderstanding ability?

I need to decide if you want to try to install a single module cDAQ to reduce the lengths of cable and connectors or am I better of just any half offensive for the cRIO.

Thank you!!!

Hi ckc8302.

Your assumption is correct - none of the single - or multi - slot USB, ethernet or wireless CompactDAQ chassis is able to execute code in a mode stand alone as you are used to with your cRIO with LabVIEW RT and/or LabVIEW FPGA.  You can use a stand-alone cDAQ for this purpose (such as the cDAQ-9139) who almost certainly beats the savings target you are trying to answer in the present case.

You are also right in saying that cDAQ USB (9171, 9174, 9178) are supported with LabVIEW RT in general targets, but the downside is that they are supported only with x 86 / x 64 targets as the cDAQ-9138/9139, cRIO-9081/9082 and PXI systems.  Value cRIO controllers use a different processor and architecture of the o/s to implement a LabVIEW RT support, and these objectives are unfortunately not taken in charge by NOR-DAQmx and CompactDAQ.

You might consider would be to buy a cheap computer and run a version of Windows on it or make a RT Office for use with LabVIEW RT.  You can then use it to host your proposed solution of cDAQ USB, and you can run LabVIEW code on this desktop computer to publish data on the network for your existing systems of cRIO consumption.  The only other option I could think of at the moment would be to continue your TC probes out to your cRIO of wiring systems, as you mentioned.

I hope this helps.

Tags: NI Hardware

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