Allen-Bradley 2711-B5A8L1 PanelView 550 HMI Terminal

Allen-Bradley 2711-B5A8L1 PanelView 550 Standard Terminal is a 5.5-inch monochrome HMI with keypad and touchscreen input, designed for panel mounting and powered from 24 V DC (18–30 V DC, 24 V nominal) at up to 18 W. The display yields 256 x 128 pixels on a 120 x 60 mm area with blue-mode monochrome LCD for clear readouts, and it includes a DH+ port plus RS-232 printer port for serial communication. It supports PanelBuilder32 software, ATA memory cards, and offers about 170 KB of application runtime with 240 KB nonvolatile RAM for objects, text, and bitmaps, along with multi-network options such as EtherNet/IP, DeviceNet, ControlNet, Remote I/O, DH-485, and RS-232 (DH-485/DF1) with appropriate modules. Typically deployed with older Rockwell controllers (SLC 500, PLC-5, MicroLogix) to provide DH-485/DF1 communications and reliable HMI access in industrial environments.