Allen-Bradley 2706-M1N1 Operator Interface – 2706 Series

Technical Dossier

Product Details And Specifications

Allen-Bradley 2706 Series Technical Notes

The Allen-Bradley 2706 Series, commercially known as the Dataliner Message Display, is a dedicated industrial operator interface platform developed by Rockwell Automation. Deployed across chemical processing plants, petroleum refineries, nuclear facilities, and heavy manufacturing lines worldwide, the 2706 Series has served as a front-line HMI solution for decades. Its primary function is to display alphanumeric process messages, alarm notifications, and operator prompts on the plant floor without requiring a full SCADA terminal.

The series is deeply embedded in legacy DCS and PLC architectures globally. Facilities running Allen-Bradley PLC-5, SLC 500, and MicroLogix controllers frequently rely on 2706 displays for localized operator feedback. The installed base is substantial, meaning procurement teams continue to source these units for maintenance, repair, and overhaul (MRO) programs long after the product line entered its end-of-life phase.

The Evolution of 2706 Series Architecture

The 2706 Dataliner platform was introduced in the 1980s as a cost-effective alternative to full-panel HMI terminals. Early units communicated via RS-232 serial links and were programmed using dedicated handheld terminals or PC-based software. The architecture was intentionally simple: a fixed-character LCD or LED display, a serial communication port, and an onboard message memory capable of storing pre-defined text strings triggered by PLC data table values.

Over successive hardware revisions, Rockwell expanded the series to include DH-485 network connectivity, allowing multiple Dataliner units to share a single communication trunk with Allen-Bradley SLC 500 controllers. This was a significant architectural shift — it moved the 2706 from a point-to-point peripheral into a networked display node. Later variants added RS-422 support and expanded message memory.

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

2706 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the core of the Allen-Bradley 2706 Dataliner product family. Each unit is categorized by display type, communication interface, and primary application context.

Operator Interface / Display Units:

• 2706-M1N1: 1-line × 20-character LCD display, RS-232 serial, panel-mount, low-power operator message terminal.
• 2706-M2N1: 2-line × 20-character LCD display, RS-232 serial, expanded message visibility for dual-line process feedback.
• 2706-P21: 2-line × 20-character display, RS-232 / DH-485 dual-port, DIN-rail mount, SLC 500 compatible.
• 2706-P22: 2-line × 20-character display, RS-422 serial interface, suited for longer cable runs in large plant layouts.
• 2706-P42: 4-line × 20-character LCD, RS-232 / DH-485, panel-mount, standard workhorse for SLC 500 alarm display.
• 2706-P44: 4-line × 40-character LCD, RS-232 / DH-485, extended message length for complex process descriptions.
• 2706-P72: 7-line × 20-character LCD, RS-232 / DH-485, high-density message display for multi-alarm monitoring stations.
• 2706-P74: 7-line × 40-character LCD, RS-232 / DH-485, maximum character density in the standard Dataliner range.
• 2706-NB1: Network-only Dataliner node, DH-485 bus interface, no local keypad, designed for remote display applications.
• 2706-NB2: DH-485 network display with integrated keypad for operator acknowledgment of alarm messages.
• 2706-F11B: NEMA 4/4X rated front panel display, 1-line, RS-232, designed for washdown and outdoor enclosure mounting.
• 2706-F21B: NEMA 4/4X rated, 2-line × 20-character, RS-232, front-panel sealed unit for harsh environments.
• 2706-F42B: NEMA 4/4X rated, 4-line × 20-character, DH-485 capable, sealed for chemical and food processing environments.
• 2706-F72B: NEMA 4/4X rated, 7-line × 20-character, DH-485, high-line-count sealed display for complex alarm panels.
• 2706-P44C: 4-line × 40-character, RS-232 / DH-485, with contrast-enhanced LCD for high-ambient-light industrial environments.
• 2706-P72C: 7-line × 20-character, contrast-enhanced LCD variant, DH-485, for control rooms with variable lighting conditions.

Sourcing Hard-to-Find & Obsolete 2706 Series Parts

The Allen-Bradley 2706 Series reached end-of-life (EOL) status, and Rockwell Automation no longer manufactures or provides factory repair services for most variants. This creates a well-documented procurement challenge: facilities with 2706 units embedded in certified panel designs cannot simply substitute a PanelView without engineering re-validation, re-wiring, and in regulated industries, re-certification.

Quality Control for the 2706 Series Range

The 2706 Dataliner units present specific quality verification challenges due to their age and the nature of their communication interfaces. DriveKNMS applies the following test protocol to all 2706 units prior to shipment:

• Power-on verification: Unit is powered at rated voltage (typically 24VDC or 120VAC depending on variant) and display initialization is confirmed.
• Serial communication test: RS-232 loopback and DH-485 network enumeration tests are performed using Allen-Bradley compatible test equipment to verify port integrity.
• Message display test: Pre-loaded test messages are triggered and verified across all display lines and character positions to identify dead pixels or character generator faults.
• Memory retention test: Onboard message memory is written, power-cycled, and read back to confirm non-volatile storage integrity.
• Physical inspection: Connector pins, housing, and front panel are inspected for corrosion, mechanical damage, and label legibility.

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.