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+--- Thread: KC868-A16S Analog input 4-20mA connection (/showthread.php?tid=5713)
KC868-A16S Analog input 4-20mA connection - nicolouts - 05-10-2024
Hello,
I have a KC868-A16S device and I want connect 3 Analog sensor on it.
My sensor provide a 4-20mA signal with 24VDC voltage.
So I need to convert one of my signal to 0-5V with 250 ohms resistor and connect to CH1 or CH2
But I want to be sure, if I can connect directly my 4-20mA directly to CH3 and CH4 without damage the ADC of the ESP32.
I know that maximum voltage for ESP32 ADC is 3.3VDC, is there a protecting circuit on KC868-A16S to prevent damage?
What the purpose of LM224 on the drawing?
Thank in advance.
Regards
Nicolouts
RE: KC868-A16S Analog input 4-20mA connection - admin - 05-10-2024
use by 24V sensor is no problem, because work current also is 4-20mA.
LM224 is an operational amplifier.
RE: KC868-A16S Analog input 4-20mA connection - nicolouts - 05-10-2024
Hello,
Thank you for your feedback.
Do you have a wiring connection to be sure?
My sensor is active, so it provide 24VDC to the current oop, can I connect GND together?
Regards
Nicolouts
RE: KC868-A16S Analog input 4-20mA connection - admin - 05-10-2024
+24->your sensor power input, your sensor power output to KinCony's board's analog input port (current channel), analog input port --> your 24v power's GND. two power supply GND need connected together.
RE: KC868-A16S Analog input 4-20mA connection - nicolouts - 05-14-2024
(05-10-2024, 10:49 PM)admin Wrote: +24->your sensor power input, your sensor power output to KinCony's board's analog input port (current channel), analog input port --> your 24v power's GND. two power supply GND need connected together.
Hello,
Thank you for your feeback.
Regard
Nicolouts