Industruino with a [24V 4-20 mA] Transducer
I had a small project of reading 4-20 mA (24V) pressure transducer reading to a computer (which would be logged). I plan to go with Industruino due to the Din rail and 24v power compatibilities. I had some questions regarding the setup:
- The analog input channel on the Industrunio, does it directly work with 24v input, or i need to add a ~ 250 ohm resistor to bring down the 24v to 5V ?
- I plan to use a IS Barrier like EATON MTL 7787+ or 7788R+ to the setup, between Industruino and Pressure Transducer... Any advice or similar experience anybody had with such a setup?
- For an order on the site, how do I specify the MCU on the Industruino 1286 or 32u4 ?
PS.. I'm not from an electronics background so my understanding is limited, so a little basic level explanation would be appreciated; Thanks!
Hi Chiradeep
Wiring 2-wire 4-20 mA to IndIO is easy : You just connect your sensor's + to +24Vdc, then your sensor - to the analog input and that's it. No need for resistors (that's for old-timers).
Using an IS barrier is probably unnecessary since your I/O card is already isolated. If you insist on using it, you will need 2 24Vdc power supplies : One sensor-side, and one IndIO-side.
I would rather order a D21G. 1286 and 32U4 are obsolete now ...
Hope this helps,
Didier, DG2R
Also, my pressure sensor would be placed in a hazardous environment, hence the IS barrier is a better option to be.. normally in our PLCs we see a single power source powers up everything..
Hi Chiradeep, If you use a single power supply, even a high-rated one, and you power up both sides of your IS barrier with it, you are creating a common point through your IS barrier ... I would not advocate that. Better use two different PS on each side ot the barrier. Hope this helps, Didier, DG2R
Hi Chiradeep, If you use a single power supply, even a high-rated one, and you power up both sides of your IS barrier with it, you are creating a common point through your IS barrier ... I would not advocate that. Better use two different PS on each side ot the barrier. Hope this helps, Didier, DG2R
Hi Chiradeep
Wiring 2-wire 4-20 mA to IndIO is easy : You just connect you sensor's + to +24Vdc, then your sensor - to the analog input and that's it. No need for resistors (that's for old-timers).
Using an IS barrier is probably unnecessary since your I/O card is already isolated. If you insist on using it, you will need 2 24Vdc power supplies : One sensor-side, and one IndIO-side.
I would rather order a D21G. 1286 and 32U4 are obsolete now ...
Hope this helps,
Didier, DG2R
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| Asked: 1/10/20, 2:58 AM |
| Seen: 1597 times |
| Last updated: 1/10/20, 11:27 AM |
Thank you Didier, for the clarifications. One more query... if if use a high rated power supply then can i power up the sensor and IND I/O using the same?