Description

The Allen Bradley 2711-M3A18L1 is a monochrome keypad-based operator interface terminal from the PanelView 300 series, designed for seamless integration with Allen Bradley SLC 500, PLC-5, and MicroLogix programmable controllers. Featuring an 18-line text display and a durable tactile keypad, this terminal delivers reliable human-machine interaction for monitoring, data entry, and machine control in space-constrained or cost-sensitive industrial applications.

Application Scenarios

At a municipal wastewater lift station in the Midwest, operators relied on analog gauges and manual valves, leading to delayed responses during storm surges. By installing the 2711-M3A18L1 at each pump skid, engineers enabled real-time visualization of wet well levels, pump run hours, and alarm history—pulled directly from a MicroLogix 1500 controller via DH485. The full numeric keypad allowed instant adjustment of high-level setpoints during extreme weather, while the compact NEMA 4X-rated enclosure withstood constant humidity and chemical exposure. Within one rainy season, the system prevented three potential overflows—demonstrating how the 2711-M3A18L1 transforms critical infrastructure into responsive, operator-centric assets.

Parameter

Main Parameters Value/Description
Product Model 2711-M3A18L1
Manufacturer Rockwell Automation (Allen Bradley)
Product Category Keypad Operator Interface Terminal / HMI
Display Type Monochrome LCD with anti-glare film
Display Size 3.8 inches (viewable area: ~96 x 64 mm)
Display Lines 18 lines of text (20 characters per line)
Input Interface 10 programmable function keys + full numeric keypad + navigation arrows
Communication Ports DH485 (primary for SLC/PLC 5), RS-232 (printer or serial peripheral)
Power Supply 24 VDC nominal (operating range: 18–32 VDC)
Mounting Method Panel mount with NEMA/IP-rated gasket (IP65/NEMA Type 12/13/4X when sealed)
Operating Temperature 0°C to +55°C
Firmware Version Typically Rev 4.46 (field-upgradable via PanelBuilder 32)

Technical Principles and Innovative Values

• Innovation Point 1: The 2711-M3A18L1 uses deterministic polling over DH485 to maintain real-time data integrity with legacy Allen Bradley PLCs, ensuring sub-second screen updates even in electrically noisy environments like pump rooms or motor control centers.
• Innovation Point 2: Its 18-line display maximizes information density without requiring graphical resources—ideal for applications needing long alarm logs, batch recipes, or multi-parameter status screens in a small footprint.
• Innovation Point 3: The dual-layer silicone keypad offers >1 million actuation cycles and glove-compatible tactile feedback, making the 2711-M3A18L1 suitable for washdown zones, cold storage, or outdoor enclosures.
• Innovation Point 4: Built-in contrast adjustment and optional backlight compensation ensure consistent readability under varying lighting—from dim basements to direct sunlight near manholes.