Operators reported that a machine's HMI no longer provides the functionality for the operators to select a button and hold it down. They log in and can press these buttons, but when they try to hold them down, they become unselected after 1 second or so. The holding down ability is needed for scale taring buttons. Apparently it used to provide this and now doesn't. They replaced it twice with two spares configured the same way, still same issue with those as well.
The HMI is on the network, so I can remotely log in to the same screen, and they can watch my cursor as I click and hold down the same buttons successfully.
As I can do it via the mouse, this indicates that the software is working correctly, and it may be a setting on the Windows OS of the HMI - in device manager maybe, or a setting on the HMI itself?
The HMI is manufactured by Beckhoff, and the HMI software is COPA-Data Zenon Runtime.
Any thoughts? Thanks