Allen-Bradley 2711-NL1 is the replacement backlight lamp for PanelView 550 terminals, including configurations such as 2711-K5A1 and 2711-B5A1. Rockwell documentation identifies 2711-NL1 as the halogen backlight lamp specified for all PV550 terminals, providing the illumination needed for readable PV550 displays. Use this part to restore backlighting in PV550 units when the original lamp has failed, without replacing other display components.
