Siemens alarm 14910: Channel %1 block %2 invalid angle of aperture for programmed circle

What it means

For a circle programmed with aperture angle AR=, the value lies outside the permitted range (greater than 360 degrees or non-positive), making the arc undefined. The aperture angle together with the radius must describe a feasible arc between start and end. Correct the AR= value.

Likely causes

• AR= greater than 360 degrees or zero/negative
• Aperture angle inconsistent with programmed radius/end point
• Unit confusion (degrees vs radians) when computing AR