Dynamic status image
For an image element can display a dynamic status, it is necessary to assign a status device in the status section of the properties menu (if no status device has been assigned, the element is automatically a 'simple' image).
If a status device has been assigned, you can only select status images from the NEO image catalog. These status icons are images sets consisting of multiple images. Each image indicates a special status of the device.
Further reading: How to import your own status images