The LED control allows a binary value to be displayed on a form. Each LED control in a group (bound by a LED_FRAME) is assigned a bit position within a binary coded integer word. When a value is written to the group of LED controls, each LED is turned on or off depending on whether on not its corresponding bit within the value is a 1 or 0.LED controls cannot be placed directly on a form, they must be bound by a LED_FRAME control.