Allen-Bradley 1784-SD2 ControlLogix/CompactLogix 2 GB Secure Digital Memory Card

Product Overview

The 1784-SD2 serves as a specialized, industrial-grade Secure Digital (SD) Memory Card designed specifically for the Allen-Bradley ControlLogix and CompactLogix controller families. This high-reliability storage module provides a secure environment for non-volatile memory backups, data logging, and project portability. We supply this unit as 100% Brand New original hardware, ensuring your automation system maintains strict data integrity and rapid disaster recovery capabilities.

Technical Specifications

The 1784-SD2 features optimized storage parameters for high-performance PLC environments:

Engineering Advantages

• Non-Volatile Project Backup: This card stores a complete copy of the controller project (user program, tag data, and configuration). It allows the processor to automatically restore the program following a power loss or hardware replacement without requiring a secondary PC connection.

• Extended Data Logging: The 2 GB capacity provides ample space for storing high-frequency production data, alarm histories, and recipe files directly on the controller hardware, bypassing the need for immediate HMI or SCADA intervention.

• Simplified Controller Migration: Maintenance teams use the 1784-SD2 to mirror configurations across multiple machines. You simply insert the card into a new processor to clone settings, significantly reducing commissioning time.

• Industrial-Grade Endurance: Unlike consumer-grade SD cards, the 1784-SD2 utilizes high-endurance flash memory. This architecture withstands the continuous read/write cycles and high-vibration environments typical of industrial control cabinets.

• Security & Integrity: The card supports firmware storage, ensuring that the controller operates on a validated, stable software version even after deep power cycles.

Installation & Best Practices

1. Slot Orientation: Locate the SD slot behind the front access door of the Logix controller. Insert the card with the label facing the designated direction until the locking mechanism clicks.

2. Read/Write Switch: Check the physical lock switch on the side of the card. Ensure it remains in the "unlocked" position if the controller needs to write log files or save project updates.

3. Firmware Updates: Use the 1784-SD2 to perform "Card Load" operations. This allows the system to update the controller firmware directly from the memory card during boot-up.

4. Card Removal: Always initiate the software "Unmount" or "Eject" command through RSLogix/Studio 5000 before physical removal to prevent data corruption.

FAQs

Q: Can I use a standard off-the-shelf 2 GB SD card instead of the 1784-SD2?

A: While standard SD cards may fit the slot, they lack the industrial-grade wear leveling and vibration resistance of the 1784-SD2. Using non-industrial cards often leads to data corruption, project loss, and controller initialization errors.

Q: Does this card ship with a pre-loaded project?

A: No. This is a 100% Brand New, unformatted card. You must load your specific ControlLogix or CompactLogix project onto the card using Studio 5000 software after installation.

Q: How does the 1784-SD2 handle power failure during a write operation?

A: The card’s internal controller minimizes data fragmentation. When paired with a Logix controller’s Energy Storage Module (ESM), the system ensures sufficient power remains to complete critical write operations to the SD card.

Q: Is the 1784-SD2 compatible with all CompactLogix processors?

A: This card primarily supports the CompactLogix 5370 and ControlLogix 5570 series (and newer). Older processors (such as the 1769-L32E) use CompactFlash cards rather than SD cards; always verify your controller's physical slot type before purchase.