Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: fluidpowerman on January 20, 2015, 03:11:02 PM

Title: Is do more fast enough?
Post by: fluidpowerman on January 20, 2015, 03:11:02 PM

I have an application I am looking at where I want to read the following

2qty. pressure inputs (via pressure transducer)
2qty. temperature inputs (via temperature transducer)
2qty. torque inputs  (load cell)

All inputs are voltage 0-5vdc

I am looking to read at 500 hz., which I believe translates to 2ms.  With some ladder logic take my readings add the values and take the average for a value every 100 ms.  Then log the data to create a table and graph.  I would like to use the domore plc but I believe the analog inputs are limited in speed.  Does anyone have any input.  Not sure if I can do this with a PLC. 

Thanks in advance for any input

Title: Re: Is do more fast enough?
Post by: franji1 on January 20, 2015, 04:04:22 PM

Not sure of the timings on 205 analog vs. Terminator I/O analog.  Do-more CPUs are available for either I/O system.

Title: Re: Is do more fast enough?
Post by: ADC Product Engineer on January 20, 2015, 04:20:42 PM

I don't think we have any analog that is capable of resolving that fast.  A 2ms resolve time is getting into DAQ territory.

Title: Re: Is do more fast enough?
Post by: fluidpowerman on January 20, 2015, 04:32:04 PM

That's what I thought.

Has anyone worked with Data Acquisition and have any platform preferences?  I am new to the DAQ world at those speeds.

Thanks again

Title: Re: Is do more fast enough?
Post by: Controls Guy on January 20, 2015, 08:57:09 PM

I use a Windows based product called DAQ Factory from Azeotech.com all the time, mostly as an HMI for PLC controlled systems.  I've never used it for this type thing, but that and PC-based control is really more its background than pure HMI.

For hardware, it's often used with a DAQ / I/O product called LabJack that connects via USB or Ethernet, and has a streaming mode for high frequency inputs including analog. The hardware is also smart and can linearize TC inputs, do counting and pwm onboard, etc.  (I haven't used the LabJack product myself, this is all stuff I've got from threads on the DAQ Factory forum)

Title: Re: Is do more fast enough?
Post by: fluidpowerman on January 21, 2015, 10:07:13 AM

I will take a look.  Thanks to everyone again for your input :)