Outputs with Beckoff 2809 and 2404

[DReAM-FabLab]

Hello everyone,
I'd like to share some troubles I'm facing dealing with IO, basically I can't get any tension on the desired ports

on the Workvisual side everything should be fine, I configured the PLC connections I need (Beckoff 2809 and 2024 ) and I can get the status LEDs of those PLC in the KRC4 cabinet on when I change the output values on the smartpad.

the problem is that I can't measure any voltage coming from them... seems like an electric grounding problem, where do you usually connect the negative ground?

on the 2809 I take the ground from the '-' connector of the main PLC as in the picture.
https://www.beckhoff.com/english.asp?ethercat/el2809.htm


on the 2024 I can have the controlled positive signal and the corrisponding ground (https://www.beckhoff.com/english.asp?ethercat/el2024.htm)


I hope i'm missing something, cos I can't get any explanation :S
thank you all in advance!

[Johannes @ Robots in Architecture]

Fortunately that one is easy to solve, you need to bridge plus/plus and minus/minus on the coupler.
I've attached a random photo (disregard anything else in there) where it shows that the upper + is connected to the lower +, which in turn is then connected to the power supply. Same for negative.
Just take special care not to short something!

Best,
Johannes

[Johannes @ Robots in Architecture]

...and you could also use your https://www.beckhoff.com/english.asp?ethercat/el9100.htm to supply the voltage, but it seems to be only connected to the + Infeed, no - Infeed.

[DReAM-FabLab]

Johannes, thank you for the prompt reply, it helped a lot in the development, i supposed the supply was given through a bus laying on the background.
I've tried the 9100 too but ofc it couldn't work that way.
everything works now,
new tools are coming!
stay tuned!