How to detect if UMI7764 power is turned off?

[GARCIA_CHIH]

I like to detect UMI if UMI power is turned off to stop all processing jobs. Can it be with an event?

[JedRetherford]

GARCIA CHIH,

Unfortunately, there is no built in functionality on the UMI that allows you to detect whether or not the UMI is powered on.

It may be possible for you to create some external custom circuitry to do this type of thing, however it is not natively supported on the UMI.

If you could post some additional details about your motion control system, and what you are trying to accomplish with the system, then this forum may be able to help you think of a way to work around this issue.

Best of luck with your application.

Regards,
Jed R.
Applications Engineer
National Instruments

[GARCIA_CHIH]

I have PCI-7344 connected to a UMI7764. The UMI will be powered with 5V, but the user can press stop button and turn off the UMI, so I need to detect this state with the PCI-7344 to stop all process activity.

[JedRetherford]

GARCIA CHIH,

It sounds like the reason for your stop button is to stop all motion from your motion control system. If you want to stop all motion in your motion control system, cutting power to the UMI-7764 is not the recommended method to stop all motion. Instead you would want to wire a button to either the "Inhibit All" or the "Shutdown" input on the UMI. The inhibit all input will disable all motion as long as the input signal remains high, and will allow motion to begin again when the input signal goes low. The shutdown signal will cause all motion to stop when the input is pulsed high, and motion will remain stopped until either the UMI power supply or the computer are powered down and then back up again. For details on the "shutdown" fea
ture, please see the following KnowledgeBase:

Implementing an Emergency Stop (E-Stop) With the PCI-7344

For more details on either feature please see the user manuals for both the UMI-7764 and the PCI-7344:

Universal Motion Interface (UMI) Accessory User Guide

7344/7334 Hardware User Manual

Regards,
Jed R.
Applications Engineer
National Instruments