Axis getting stuck at limit switch

[RoBoTzRaWsUm]

Hi all,
The problem I'm having is that although I can control the position of the axis fairly well, if it hits a limit switch, I can't get it to move from there. It's a stepper motor controlled by a PCI-7344. I have forward and reverse limit switches as well as a home switch. I actually have two axes doing the same thing. They are facing each other so while one stepper has a positive rotation and the other a negative, they both turn the same way, if you get what I mean. Anyway one of them is working fine and stops at the limits and comes back at the next command, but the other stops and thows up a 70119 error when I try to get it to move back from the limit. I'm pretty sure everything (ie. limit switches) is wired up correctly so assuming it is, can anyone make a suggestion as to what the problem could be???


Thanks,
Damo.


PS. OMG robot smilies!!!!

[Jochen]

Error 70119 means:

In general this error occurrs, if you either try to move further into the active limit switch or if you try to move out of an active limit switch while the forward limit switch is connected to the input of the backward limit switch and vice versa.

If you are 100% sure that the wiring is correct, please check the version of your NI-Motion driver and the board's firmware. In NI-Motion 6.0 there was an issue with this error that was fixed in later versions. The current version of NI-Motion is 7.6.

I hope this helps,

Jochen Klier
National Instruments