Product Details
Overview
The 1785-MJ by Allen-Bradley is a dedicated memory module designed for PLC-5 systems, providing secure program backup and reliable data storage. Optimized for standard PLC-5 processors, it ensures consistent system operation and safeguards critical control programs.
Technical Specifications
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Model: 1785-MJ
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Module Type: Memory Module
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Memory Capacity: 8K Words (6K SRAM usable)
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Write Protection: Removable jumper for added data security
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Primary Function: Program backup for PLC applications
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Supported Processors: Standard PLC-5 series
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Backplane Power Requirement: 2.5 A at 5 V DC
Compatibility
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PLC-2/17 Series: 1772-LW, 1772-LWP
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PLC-5 Series: 1785-LT (10), 1785-LT2 (12), 1785-LT3 (15), 1785-LT4 (25)
Environmental Conditions
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Operating Temperature: 0° to 60° C (32° to 140° F)
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Storage Temperature: –40° to 85° C (–40° to 185° F)
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Relative Humidity: 5–95% (non-condensing)
Size & Weight
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Dimensions: 2.18L x 1.73H x 0.69D in (55.4 x 43.9 x 17.4 mm)
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Weight: Approx. 0.34 kg
Additional Features
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Designed for secure program backup in PLC-5 systems
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No removal under power (RIUP) capability
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Compact form factor fits standard PLC-5 backplane
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Reliable SRAM ensures stable performance under industrial conditions
Applications
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Industrial PLC-5 automation systems
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Program backup and memory extension
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Control system redundancy and protection
FAQ
Q: Can this module be used in PLC-5 processors of all memory sizes?
A: Yes, it is compatible with all standard PLC-5 series processors.
Q: Does it support hot-swapping?
A: No, removal under power is not supported.
Q: What type of memory does it use?
A: It uses SRAM with write-protection jumper for secure backup.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Mastering PLC Power Supply Architectures and Operating Voltages
Selecting the correct operating voltage is a critical step in designing reliable industrial automation systems. Whether you are working with a compact PLC or a large-scale DCS, your power architecture dictates the system's longevity. In this guide, we explore the standard voltage ranges and power distribution strategies required to maintain stable factory automation operations.
Optimizing Power Supply Sizing for Industrial Automation Systems
The power supply is the silent heartbeat of any industrial automation system. While engineers often prioritize processors and communication protocols, a stable power architecture remains the most critical factor for long-term reliability. In my 15 years of experience, I have found that neglecting power supply sizing often leads to ghost errors, intermittent field device failures, and costly production downtime.