HMI (Human Machine Interface) can work with most of other brand named PLC's Text display OP570-X 42 film keys: 10 number keys, 32 function keys, in which 16 function keys can be defined freely with cards that can be drawn out. There are 16 key indicate lamps on the panel, can be use to indicate PLC status Choose communication format freely, any of RS232 / RS422 / RS485STN LCD display with backlight, the distinguish ratio is 320*240, can display 40 letters*15 lines5. 7 inch, monochrome or Color LCD, 320*240 pixels, 4MB FlashROM, 4KB SRAM, can input any characters you need.