Delta power solutions [india] pvt ltd [dps india] is 100% subsidiary of delta electronics inc., a part of us$4.2 bn delta group. The bn delta group of companies is one of the largest manufacturers of industrial automation products, telecom power supplies, ups, networking, video display, components, solar power system and automotive products. The company supplies wide range of human machine interfaces [hmis] for most applications. Dop-ae series of human machine interfaces delta operator panel [dop] are latest entrant in the family with touch screen; few membrane keys that behave function keys; and system keys. Some of the salient features of the human machine interfaces are 3.8" up to 10.4" display size with monochrome to 65536 colours of lcd display; 640 x 480 pixels resolution; and ccfl backlight in most dop increases display quality; 3m to 7m flash memory; 256k to 512k sram; 8 security levels with password protection for authorisation control; minimum two inbuilt communication port to connect with different controller; and supports different plcs for communication. Some dop human machine interfaces are suitable for connecting to various kind of optional extension module like extension dio module, extension printer module, and extension ethernet module to extend its functionality through extension interface. The dop series human machine interfaces are available with technical specifications like easy to understand and use dop software with multi-language interface; online simulation and offline simulation option for easy debugging; software equipped with convenient screen management function and multi screen editing option to increase comfort level of programmer.