Data Acquisition Idea Exchange

Dear NI, please consider a future hardware feature addition:

Add a "Power Up Delay DIP Switch" to the back of the PXI Power Supply Shuttle.

It would allow end users to reliably sequence the powering-up of multi PXI chassis solutions. It could also be handy to sequence any other boot-order sensitive equipment in the rack or subsystem. This would also be a world-voltage solution since this capability already exists in the power shuttle. We are seeing the need for more input-voltage-agnostic solutions. I'm sure you are too.

It might offer time delay choices of 1,2,4,8,16 seconds, etc.

We run into this problem on every multi-chassis integration. We have solved it several ways in the past like: human procedure (error prone), sequencing power strips ($$$ and not world-voltage capable), custom time-delay relays ($$$).

Imagine never having your downstream chassis(s) disappear. Or worse yet, having them show up in MAX, but act strangely because of not enough delay time between boots.

Thanks for reading this, and consider tossing me a Kudos!

Absolute encoders have been around for some time, but NI's motion hardware still supports only incremental encoders.  I would like to see support for absolute encoders in NI Motion or NI Soft Motion.

NI supports almost any bus.  Why not SSI (synchronous serial interface) ?  

Of course, there is always the option to use an R series card and then build an interface.  Why not have a low-cost PCI or USB card? Also, perhaps a C-series module, so that we don't have to take up FPGA space?

Dear NI Idea Exchange,

I had a service request recently where the customer wished to use a mass flow meter, using the HART protocol (massive industrial protocol used worldwide with over 30 million devices) to communicate updated values to a cRIO 9074 chassis using a NI 9208 module.

They did not know how they could use this protocol with our products. There was only one example online regarding use of this protocol using low level VISA functions. There is currently no real support for this protocol.

I suggested that if they wished to use this sensor they would be required to convert it to a protocol we do support, for example Modbus or to RS-232 (using a gateway/converter).

Then they could use low level VISA functions to allow the data communication.

They were fine with doing this but they felt that NI should probably support this protocol with an off-the-shelf adaptor or module. This is the main point of this idea exchange.

There is clearly a reason why we do not currently provide support for this protocol in comparison to PROFIBUS or Modbus.

I thought I would pass on this customer feedback as it seemed relevant to NI and our vision. 

Regards,

Dominic Clarke

Applications Engineer

National Instruments UK

To save a bunch of typing, the following is copied verbatim from a post I made years ago: 

While the thread is fresh and FWIW, I'd like to add my own additions to a counter/timer wishlist:

1.  Hardware-reload of count register based on signal edge.  Currently, the only feature that's fairly close is the "Z-index reload" feature for encoder position measurement.  There are many limitations and at least one quirk as presently implemented.

 

A. It only works in "position measurement" (a.k.a. "encoder") mode.   At minimum, it should also be supported in edge-counting mode provided the other limitations/quirks are addressed.  I've done a lot of measurements with an encoder mounted to a step-and-dir stepper motor.  The step-and-dir motor must be measured as an edge-counting task with hw-controlled direction.  The encoder's z-index pulse CAN'T be used to hw-reload the count of the edge-counting task in sync with the encoder task.  It'd be GREAT if it could.  Hw-reload of count could also be useful in other counter tasks, especially pulse(train) generation.  I can imagine some clever tricks in the other modes (such as period measurement) as well.

 

B. It must be programmed to be "active" only during a specific 1 of the 4 possible states of encoder channels A & B -- LL, LH, HL, HH.  This works out fine for real-life encoders that supply their own z-index signal.   However, I've had numerous occasions where I would have logically preferred to reset the count value based on some other system pulse signal (can you say "Limit switch"?).   I'd have liked to say, "perform hw-reload on rising edge of Z-index signal regardless of A&B state".  But no such designation exists.  I'd rather have the choices {Low, High, Either} for both A & B config.

 

C. The Z-index signal must be hard-wired to the counter's default GATE pin on the 6602 board.  I *think* but haven't verified that it's user-selectable on the M-series.  Dunno if it supports just PFI inputs or also RTSI signals.  I would like to see a next-generation Counter/Timer allow user-programmable inputs for Z-index as well as encoder A & B channels.

 

D. At least on the 6602, the Z-index behavior is STATE-driven rather than EDGE-driven.  Z-index reload happens whenever A&B are in the programmed state and Z is High.  I tested by hard-wiring the Z-index signal to +5V and my X4 quadrature task counted 0,1,2,3,0,1,2,3,0,1...   I don't recall this being spelled out clearly in the documentation -- I remember expecting it to be sensitive to a rising edge rather than a high state.  I would very much like the option of making the hw-reload sensitive to an EDGE -- ideally {Rising, Falling, Either}.

Note: wishlist item "1C" has been fulfilled in M-series counters and probably also in X-series which I haven't yet tried.

-Kevin P