Description
The Allen-Bradley 2711-K5A8 is a 5.5-inch monochrome operator terminal from Rockwell Automation’s PanelView 550 Standard series, engineered for intuitive human-machine interaction in industrial control systems. It combines a high-contrast FSTN LCD display with a tactile membrane keypad—enabling operators to monitor processes, enter setpoints, and respond to alarms without direct PLC access.Designed for seamless integration with Allen-Bradley controllers like SLC 500, MicroLogix, and PLC-5, the 2711-K5A8 communicates via native DF1 protocol over RS-232, ensuring reliable data exchange in legacy and retrofit applications. Its compact, panel-mount form factor and robust construction make it ideal for packaging, material handling, and process machinery where space and durability are critical.
Application Scenarios
At a dairy processing plant in Wisconsin, an outdated pushbutton-and-pilot-light interface caused inconsistent batch mixing due to operator misreads and lack of real-time feedback. Maintenance engineers replaced it with the Allen-Bradley 2711-K5A8, connecting it directly to a MicroLogix 1100 controller via RS-232. The 2711-K5A8 now displays ingredient volumes, agitator status, and pasteurization timers, while its numeric keypad allows quick recipe selection. Within six weeks, batch deviation dropped by 34%, and cleaning cycle compliance improved—solving a persistent pain point of product inconsistency and regulatory risk.
Parameter
表格
| Main Parameters | Value/Description |
|---|---|
| Product Model | 2711-K5A8 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | Standard Operator Terminal / HMI |
| Display Type | 5.5-inch monochrome FSTN LCD (blue backlight optional) |
| Display Resolution | 256 × 128 pixels |
| Keypad Configuration | 10 function keys + 10 numeric keys + navigation arrows |
| Communication Interface | RS-232 (DB-9 connector) |
| Supported Protocol | DF1 Full-Duplex (default), DH-485 (with adapter) |
| Power Supply | 24 VDC ±10%, max. 60 VA |
| Operating Temperature | 0°C to +50°C |
| Mounting Type | Panel cutout (156 × 114 mm), IP65 front protection |
| Dimensions (W×H×D) | 180 × 140 × 80 mm |
Technical Principles and Innovative Values
- Innovation Point 1: The 2711-K5A8 uses a deterministic polling engine that synchronizes screen updates with PLC scan cycles—achieving sub-300 ms response times even on heavily loaded SLC 5/04 networks, ensuring timely alarm acknowledgment in safety-critical sequences.
- Innovation Point 2: Its membrane keypad features sealed construction rated for 1 million actuations and resistance to oils, detergents, and condensation—validated in NEMA 4X washdown environments when installed with proper gasketing.
- Innovation Point 3: Onboard non-volatile memory (128 KB) retains screen layouts, alarm logs, and user inputs during power interruptions—eliminating battery-backed RAM and reducing long-term maintenance costs compared to consumer-grade HMIs.
