KC868-a6 2 analog outputs (DAC)

KC868-a6 2 analog outputs (DAC) - Printable Version

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KC868-a6 2 analog outputs (DAC) - bikovalexand - 06-14-2026

Hello, I'm working on a project that uses both outputs of a KC868-a6 v1.33 controller (0-10 V DAC). I'm writing the program in OpenPLC Editor.
The signal on both outputs changes proportionally, but not from 0-10 V, only from 0-3.3 V. What could be the problem?
I tried downloading the latest version of KCS (v.2.2.20) to the controller, connecting to it via WiFi, and changing the output values. They output from 0 V to 3.3 V. I understand the LM258DR should amplify the signal by three times? Perhaps it's not working?
Thank you

RE: KC868-a6 2 analog outputs (DAC) - admin - 06-14-2026

Do you means, use KCS v2.2.20 , go to monitor webpage, change DAC bar to 100%, it output 3.3v, not 10v?

RE: KC868-a6 2 analog outputs (DAC) - bikovalexand - 06-14-2026

(06-14-2026, 11:21 AM)admin Wrote: Do you means, use KCS v2.2.20 , go to monitor webpage, change DAC bar to 100%, it output 3.3v, not 10v?

Yes, that's exactly it. And if I put 50%, I get 1.67 V

RE: KC868-a6 2 analog outputs (DAC) - admin - 06-15-2026

we have tested , no problem. see these photo.

Filename: A6-KCS_v2.png Size: 38.82 KB 06-15-2026, 01:09 AM

Filename: A6-DAC-50.png Size: 43.11 KB 06-15-2026, 01:09 AM

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Filename: A6-DAC-100.png Size: 43.51 KB 06-15-2026, 01:09 AM

Filename: A6-pcb-100.jpg Size: 356.49 KB 06-15-2026, 01:11 AM

RE: KC868-a6 2 analog outputs (DAC) - bikovalexand - 06-15-2026

(06-15-2026, 01:10 AM)admin Wrote: we have tested , no problem. see these photo.

I am attaching my photos.

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Filename: 1000032300.jpg Size: 7.63 MB 06-15-2026, 07:08 AM

I started examining the controller board and discovered that resistors R63(4.7k) and R65(4.7k), which are shown on the schematic, were missing. I've attached a photo.

Filename: 20260615_113608.jpg Size: 3.46 MB 06-15-2026, 08:52 AM

RE: KC868-a6 2 analog outputs (DAC) - admin - 06-15-2026

yes, can you add it, R63(4.7k) and R65(4.7k) solder on PCB. if you can't do it. send me your order number. we re send you a new KC868-A6 PCB.

Filename: A6-pcb.jpg Size: 482.31 KB 06-15-2026, 11:33 PM

RE: KC868-a6 2 analog outputs (DAC) - bikovalexand - 06-17-2026

(06-15-2026, 11:33 PM)admin Wrote: yes, can you add it, R63(4.7k) and R65(4.7k) solder on PCB. if you can't do it. send me your order number. we re send you a new KC868-A6 PCB.

I soldered the resistors. Everything works fine. Thanks.

RE: KC868-a6 2 analog outputs (DAC) - admin - 06-17-2026

ok, good.