Overview
The Allen-Bradley 1774-MA is a memory expansion module designed for SLC 500 modular controller systems. This 4K memory module provides additional program and data storage capacity for legacy Rockwell Automation control platforms. Though discontinued by the manufacturer, the 1774-MA remains a reliable solution for maintaining and expanding existing SLC 500 installations. The module integrates seamlessly with other PLC peripherals and supports peer-to-peer messaging capabilities.
Key Features
- 4K words of memory storage capacity
- Quick-connect sealed connectors for reliable field connections
- Compact, space-saving modular design
- Minimal wiring requirements and straightforward installation
- Deterministic, real-time performance with repeatable operation
- Robust status indicators for simplified troubleshooting
Technical Specifications
- Model: 1774-MA
- Manufacturer: Allen-Bradley / Rockwell Automation
- Memory Capacity: 4K words
- Weight: Approximately 1.5 kg (3.3 lbs)
- Connector Type: Quick-connect sealed connectors
- Design: Modular with reduced packaging footprint
- Status Indicators: Included
- Condition: Used surplus
- Compatibility: SLC 500 modular controllers
Typical Applications
The 1774-MA is suited for applications requiring legacy SLC 500 system expansion, including:
- Industrial machinery control and process automation
- Manufacturing equipment retrofits and upgrades
- Data logging and historical storage in control systems
- Extended program memory for complex control logic
- System maintenance and component replacement
Compatibility & Replacements
The 1774-MA is a discontinued Allen-Bradley memory module. For legacy SLC 500 systems, it integrates with all standard SLC 500 chassis and modular processor configurations. When evaluating modern alternatives for new installations, consult Rockwell Automation’s current product lines including ControlLogix and CompactLogix platforms. For direct replacement in existing systems, verify compatibility with your specific SLC 500 processor model and I/O configuration. As a surplus item, this module carries no manufacturer warranty but provides cost-effective memory expansion for proven legacy systems.
