Human machine interfaces from delta power solutions are categorized as delta operator or tp series. These are available in different types of dimensions, display size and performance. With these varieties human machine interfaces are suitable for various types of applications. Dops are touchscreens having some membrane keys, which work as function key, and system key. The size of the displays of the dops ranging from 3.8" up to 10.4". The lcd display is provided with monochrome to 65536 colours. The ccfl backlight of the dops help to enhance the quality of the display and the maximum resolution is 640 x 480 pixels. Because of flash memory varying from 3m to 7m and a sram from 256k to 512k it its suitable in most applications. Different elements are kept under the 8 security levels with password protection. There are at least two inbuilt communication port that help to connect them with different controller and also support different plcs for communication. The human machine interfaces of the tp series are available from 2-line to 5 lines text monochrome display and a resolution up to 160 x 80 pixels with/without numeric keypad and display size varying from 72 mm x 22 mm with a flash memory of 256k. With these are widely used in many applications. Other features of the tp series include 5 security levels with password protection, 10 sets of user passwords for flexible handling and maintaining security, two serial communication ports etc.
