Allen-Bradley 2711-M3A18L1 PanelView 300 Micro HMI Display

Allen-Bradley 2711-M3A18L1 PanelView 300 Micro HMI Display is a compact 3-inch keypad-operated operator terminal designed for straightforward on-machine visualization in industrial environments. It is powered from 24 VDC and typically draws about 2.5 W, making it suitable for installations where a low-power, single-board HMI is preferred. The unit features a monochrome display and a keypad input surface, intended for simple operator interaction at the point of use. The 2711-M3A18L1 variant communicates over RS-232 using the DF1 protocol (full duplex), and is part of Rockwell’s PanelView 300 Micro family; its sibling 2711-M3A19L1 uses DH-485. The M3A18L1 is cataloged as a 3-inch display keypad terminal and is documented in the PanelView 300 Micro terminal lineup (catalog numbers 2711-M3A18L1, 2711-M3A19L1). This is a legacy, discontinued HMI terminal commonly found in older automation installations, with configuration typically performed using PanelBuilder 32. Firmware for the DF1 variant has been documented as FRN 4.10-4.x in various references, reflecting its era of use. The DF1 RS-232 port uses an 8-pin mini-DIN connector, aligning with DF1 serial communication practices of the PanelView 300 Micro series.