NI-7340 limit and home switch indicators always active using NI Max

[Tim333]

Working with a system that is using an NI-7340 controller to drive stepper motors and using NI Max to checkout the motor operation. Earlier in the checkout process NI Max allowed motor operation with no limit switch activity. All was good. Later (somehow?) NI Max displayed indicators showing 'Both Limit Switches are Active' and 'Home Switch is Active'. Note the limit and home switches are not connected. This prevents further motor activity. I have gone into each axes 'Motion I/O Settings' configuration page and disabled all forward, reverse and home limit switches but this has not removed the limit or home switch 'active' indicators. I have also restarted the system by cycling power after disabling the limit and home switches and rechecked that the switch disabled selections were still in place. Does anyone know how to de-activate the limit switch indicators in NI Max?

[RIObotics · Accepted solution]

Hi Tim,

Try reversing the active high/low polarity for all of the offending limit switch and home switch signals.  This should make them not active anymore, which hopefully will allow motor activity to happen.

Also, just as a precaution, make sure you're using "open loop" mode for testing.  This will also prevent any following errors from the encoders, which might also prevent motor activity.

Source: I used to be a NI-motion support engineer.  Although NI has discontinued this product, I sell NI-7340 and other legacy NI products on our website, www.extendtest.co. 

BR

John

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