K6714-16 with K8000

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1

Hello,
I’m trying to control a k6714-16 relay board with the k8000. I (thought) I’d followed correctly the wiring diagrams between the 2 boards, but found that I couldn’t switch the relays. I can successfully close a relay on the k6714-16 board by applying 5V to the appropriate pins, and I know the K8000 is wired correctly- at least the LEDs of the digital outputs go on when pin 2 of the 4N33 transistors are grounded.

After looking at the wiring diagram of the k8000, specifically the area around the optoisolators, I can’t figure how this can work at all. The transistors are NPN so I don;t know how this can output a +5V signal to close a k6714-16 relay. The manual says to ground all the -'ve pins together, so it seems the switching is supposed to occur using the +5v lines.

HOwever as I’ve found no complaints after a quick search I assume it’s me that’s at fault!

Any help is greatly appreciated.
Thanks, Anna

2

The solution is similar as with the open collector outputs of the K8061.
Please see this thread (especially the last post): forum.velleman.be/viewtopic.php? … 0f6e899f1a

From the manual:

[quote]The ULN2803 type transistor array allows you to control the relays direct from a TTL or CMOS. For controlling the relay with open collector control, don’t mount the transistor arrays.

ATTENTION : In case you don’t use a transistor array (IC’s for K6714-. 16), fit the wire jumpers in the places for IC1 and IC2, marked with a dotted line.[/quote]

3

Thanks hugely whoever you are!

It works. I’ve just spent 10 minutes watching all the lights flash unnecessarily, just because I can.

btw i did read the text you copied in the email that is stated in the manual, but as I didn’t know what an open-collector output was I ignored it and followed the instructions for wiring up the “k6714-16”. If it had said “remove the ICs if you want to connect the digital I/O port to the K6714-16” I would have known better. Just in case Vellerman fancies writing an idiot’s guide to wiring it up.

Thanks again,
Anna

4

Glad to see that you got it working and you like it!
Thank you for your comments concerning the manual. Indeed, reading the posts in this forum shows that the term “open collector” output is not very well known.
Yes, maybe better to talk how to connect the K6714-16 to the “digital output” of the K8000 or K8061…

5

Biggest compliment you can give :slight_smile: Glad you got it working