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High density RTD/resistance input cards

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RyreInc

RyreInc

Electrical
Joined
Apr 7, 2011
Messages
205
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US
Hello, I am looking for an analog input card or device that measures resistance, and interfaces with an Allen-Bradley PLC, preferably using Ethernet/IP. The measurement repetition rate should be less than 500ms or so, ideally less than 100ms. Resistance range is about 50-500Ω. We need 48 channels, so high density is valued. 12-bit resolution should be sufficient. What options are out there?

I have explored the brands Wago, Allen-Bradley, Advantech, B&R, and Beckhoff so far, but each of their solutions has various drawbacks.

I am open to using a voltage input card, but the full scale range would need to be around 200mV, not the standard 10V. And plus going that route would require pull-up resistors, complicating the panel wiring.
 
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Thanks for the quick response IR. Looks like that Keithley solution is close, but it looks like it does not offer any industrial comms protocols such as Ethernet/IP, Profinet, Modbus/TCP, etc. This needs to interface directly with an Allen-Bradley PLC.
 
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The webpage I linked says "Standard LAN"

Clipboard02_tnqmwi.png


TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
 
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Spectrum Controls has a line of analog input modules for Control and Compact Logix controllers. I use 1756-IF8Usc and 1769-IF8Usc with good success.
Link

Brad Waybright

The more you know, the more you know you don't know.
 
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Acromag's busworks series is modular I/O with preloaded comm protocols (including Ethernet/IP) in the bus network module.

The 6 minute video is a good summary:
Link

voltage input modules on this page:
Link

I didn't read closely enough to see if the RTD resistance input module would do 2 wire raw resistance over your range, but most I/O modules do.
temperature (resistance) modules on this page:
Link
 
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