Description
1. Product Overview
Allen‑Bradley 2711‑K5A5 is a keypad‑operated human‑machine interface (HMI) terminal of the PanelView 550 Standard series under Rockwell Automation. It belongs to the classic first‑generation PanelView Standard industrial HMI family and is designed for small‑to‑medium automated production lines, packaged equipment and assembly‑line control applications. As a monochrome keypad‑only operator terminal without touch‑screen structure, it performs equipment operation, parameter setting, screen switching and fault acknowledgment via physical keys. It serves as a dedicated HMI for legacy Allen‑Bradley PLC control systems and is widely compatible with classic Rockwell control platforms including MicroLogix, SLC500 and PLC5.
Equipped with a 5.5‑inch monochrome backlit LCD display, the 2711‑K5A5 adopts proven DH485/RS232 serial communication architecture. Featuring compact construction, strong anti‑interference capability and outstanding operational stability, it highlights industrial‑grade merits such as low power consumption, long service life and maintenance‑free performance. Supporting wide‑range AC input for global industrial mains specifications, the terminal is equipped with comprehensive status diagnosis, communication monitoring and fault alarm functions. Although this model has been phased out of production, it remains a core operator terminal for ageing automated production lines, packaged machinery, textile machines, packaging equipment, water treatment facilities and HVAC power systems. It is extensively deployed for fault replacement, equipment maintenance and technical retrofitting of legacy systems, and acts as a mainstream spare‑part model for industrial installed‑base equipment due to its superior reliability.
2. Functional Features
2.1 Industrial Keypad‑Only Design for Heavy‑Duty Field Conditions
It adopts industrial‑grade stainless steel membrane physical keys with 10 programmable function keys (F1‑F10). Free from common touch‑screen defects such as abrasion, scratching and touch failure, the keys deliver moderate actuation force with long service life, dust‑proof, water‑proof and oil‑resistant performance. Well‑suited for heavily dusty, oily and high‑frequency‑operation workshop environments, the keypad avoids key sticking, failure and mis‑triggering over long‑term operation. It fits the operating habits of field operators and achieves higher stability compared with touch‑screen terminals.
2.2 Stable Monochrome LCD Display with Long‑Term Visual Performance
The terminal integrates a 5.5‑inch monochrome transflective LCD screen with long‑life LED backlight rated for 100 000 operating hours to support year‑round continuous operation. With high contrast and anti‑glare performance, it delivers clear readability under natural workshop light and artificial illumination. It reliably presents operating parameters, fault codes, process status, alarm messages and switch status without colour shift, brightness degradation or screen distortion, offering excellent field adaptability.
2.3 Dedicated DH485 Serial Communication for Native Compatibility with Legacy AB Control Systems
Featuring integrated RS232‑compatible DH485 industrial communication port developed for classic Rockwell control protocols, it seamlessly interfaces with legacy Allen‑Bradley PLC families including SLC500, MicroLogix and PLC5. It ensures stable communication links and full protocol compatibility to eliminate communication dropout, data stagnation, screen freeze and abnormal parameter refresh. The streamlined communication architecture provides strong immunity against industrial electromagnetic interference, guaranteeing real‑time, stable and reliable human‑machine data exchange under harsh workshop conditions.
2.4 Light‑Weight Program Storage to Satisfy Conventional Equipment Monitoring
Built‑in 170 KB application runtime memory and 240 KB non‑volatile storage retain screen configurations, process parameters, alarm texts and bitmap data upon power loss. It fulfils standard HMI requirements for small‑to‑medium automated equipment, including screen configuration, parameter monitoring, fault alarming, status indication and process switching. No external memory expansion is required for traditional industrial equipment with fixed and stable processes.
2.5 Comprehensive Status Diagnosis and Operational Monitoring for Simplified Maintenance
Independent green communication indicator and red fault indicator on the front panel intuitively show power supply status, communication link condition and system faults. Field technicians can rapidly identify terminal communication failure, program error and power abnormality. Built‑in low‑level self‑diagnosis detects program exceptions, communication time‑out and hardware defects for fast fault localisation and reduces troubleshooting effort for legacy equipment.
2.6 Industrial‑Grade Dust‑Proof and Water‑Proof Construction for Durability in Harsh Environments
The front panel meets IP54/IP65 protection ratings and complies with NEMA 12/13, 4X indoor industrial standards, providing excellent dust‑proof, moisture‑resistant and splash‑proof performance. Validated against industrial vibration and electromagnetic interference, the unit withstands continuous workshop vibration, mains fluctuation, dust accumulation and humid conditions. It supports 7×24‑hour non‑stop continuous operation with low hardware failure rate and extended maintenance‑free service cycle.
3. Technical Specifications
3.1 Basic Specifications
Product Model: 2711‑K5A5 Manufacturer: Allen‑Bradley (Rockwell Automation) Product Series: PanelView 550 Standard Classic HMI Product Type: Industrial keypad‑operated monochrome HMI operator terminal Core Application: Human‑machine operation, parameter monitoring, equipment status indication, fault alarming and process control for legacy Allen‑Bradley PLC systems Key Characteristics: Keypad‑only operation, monochrome high‑definition display, stable DH485 communication, wide‑range AC power supply, high industrial protection rating, long service life and reliable low‑fault performance.
3.2 Display & Operation Parameters
Screen Size: 5.5 inch Display Type: Monochrome transflective LCD Resolution: 256 × 128 pixels Display Area: 120 mm × 60 mm Backlight: Long‑life LED, rated 100 000 hours Operation: Industrial membrane keypad with 10 programmable function keys (F1‑F10) Display Performance: Anti‑glare, high contrast, free of colour deviation, optimised for industrial lighting conditions.
3.3 Memory & Runtime Parameters
Application Runtime Memory: 170 KB Non‑volatile Program & Text Storage: 240 KB Data Retention: Permanent power‑off preservation, no backup battery required Software Compatibility: Classic PanelView configuration software; supports screen, alarm, parameter and logic configuration.
3.4 Communication & Electrical Parameters
Communication Ports: Integrated RS232 / DH485 serial port Supported Controllers: SLC500, MicroLogix, PLC5 and other classic Allen‑Bradley PLCs Power Supply: Wide‑range AC input Input Voltage: 85 ~ 264 V AC Frequency Range: 47 ~ 63 Hz Maximum Power Consumption: 45 VA Communication Performance: Real‑time data exchange, auto‑reconnection, high anti‑interference, stable transmission without packet loss.
3.5 Environmental Specifications
Operating Temperature: 0 ℃ ~ +55 ℃ Storage Temperature: ‑20 ℃ ~ +60 ℃ Relative Humidity: 5%‑95% non‑condensing Protection Rating: Front panel IP54/IP65; complies with NEMA 12/13/4X indoor standards EMC Performance: Industrial‑grade electromagnetic compatibility, tolerant of interference from workshop frequency converters and high‑frequency equipment Vibration Resistance: Withstands typical cabinet‑mount vibration and equipment start‑stop shock Operation Mode: 7×24‑hour year‑round continuous industrial operation Application Environments: Production lines, packaged machinery, water‑treatment plants, HVAC systems and legacy automation systems in light‑industry and heavy‑industry sites.
4. Hardware Configuration & Structural Advantages
4.1 Keypad‑Only Hardware Eliminates Touch‑Screen Degradation Failures
Without vulnerable touch‑screen components, the industrial stainless‑steel membrane keypad features long service life, oil resistance, wear resistance and anti‑mis‑operation capability. It eliminates frequent touch‑screen failures such as drift, unresponsiveness and panel cracking, delivering superior reliability for legacy equipment running continuously with frequent operator interaction.
4.2 Native Allen‑Bradley Serial Communication for Maximum System Compatibility
Designed for the DH485 protocol, it achieves deep integration with legacy Allen‑Bradley PLC systems. No adapter modules or protocol converters are needed. Simple networking and stable communication avoid compatibility errors, data latency and screen freezing. It serves as the original HMI offering loss‑free integration for ageing Allen‑Bradley automation systems.
4.3 Long‑Life Backlight and Display Unit with Minimal Performance Degradation
The industrial‑grade long‑life LED backlight module is rated for 100 000 operating hours with negligible brightness drop, black‑screen or flicker risk under continuous operation. The monochrome LCD panel resists ageing and image burn‑in with no ghost images for fixed‑screen long‑term monitoring, significantly reducing screen replacement and maintenance costs.
4.4 Wide‑Range AC Power Input for Excellent Mains Compatibility
Accepting 85‑264 V AC global wide‑voltage input, the terminal tolerates industrial‑grid fluctuation, voltage deviation and transient surges. It minimises unexpected reboot, system crash and offline incidents caused by unstable power supply to sustain continuous equipment operation under poor mains conditions.
4.5 High‑Protection Panel Design for Harsh Field Environments
The IP65‑rated front panel provides dust‑proof, water‑proof and oil‑resistant performance against workshop dust, moisture, cutting fluid and oil splashes, preventing short‑circuit, key malfunction and screen damage caused by particle or liquid ingress. Standard cut‑out dimensions enable straightforward cabinet panel mounting.
4.6 Streamlined Mature Hardware Architecture with Low Failure Rate
Free from complex redundant circuits and fragile touch‑screen assemblies, its proven hardware design has been validated over decades of field deployment. It delivers stable circuit performance with high anti‑interference and anti‑ageing capability. It avoids crash, program loss and parameter drift during long‑term operation and features extended maintenance‑free cycles for legacy equipment.
5. Application Scenarios
- Matching for legacy Allen‑Bradley PLC automation systems: Deployed for production lines and packaged machinery controlled by SLC500, MicroLogix and PLC5 PLCs to realise local operation and status monitoring via native HMI.
- Light‑industry packaged equipment: Applied to packaging, textile, printing and injection‑moulding machinery for process parameter setup, equipment start‑stop control, fault review and operating‑condition monitoring.
- Water‑treatment and HVAC power systems: Installed in water plants, wastewater facilities, pump stations and central‑air‑conditioning control systems to monitor pumps, fans and valves with high reliability and low maintenance overhead.
- Maintenance replacement for ageing plant equipment: Direct on‑site drop‑in replacement for units suffering black screen, keypad failure, communication breakdown and hardware damage. No program modification or cabinet rewiring is required for fast equipment recovery.
- Cost‑effective industrial retrofitting projects: Suitable for legacy‑line upgrades where colour touch‑screen functionality is unnecessary. It restores and upgrades human‑machine interaction with high reliability and low cost to revitalise installed‑base automation assets.
