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- Allen Bradley
- 1785-MR
- CMOS RAM Storage Module
- USA
- 100 x 30 x 85 mm
- 0.15 kg
- Xiamen, China
- New & In Stock
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen Bradley 1785-MR is a CMOS RAM Storage Module designed for PLC-5 systems to provide volatile memory storage with battery backup. It is used to store PLC programs, data files, and configuration information while maintaining program integrity during temporary power interruptions. The 1785-MR module is compact, reliable, and essential for backup memory in industrial automation systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen Bradley |
| Model | 1785-MR |
| Product Type | CMOS RAM Storage Module |
| Function | Volatile memory with battery backup for PLC-5 programs and data |
| Dimensions | 100 × 30 × 85 mm |
| Weight | 0.15 kg |
| Memory Type | CMOS RAM with battery backup |
| Operating Environment | Industrial automation systems |
| Compatibility | PLC-5 processors and racks supporting CMOS RAM storage modules |
Function and Working Principle
The 1785-MR module operates by:
- Storing PLC programs, configuration data, and runtime variables in volatile CMOS RAM
- Maintaining memory integrity using an internal battery
- Allowing rapid program and data access due to the high-speed RAM
- Providing temporary backup during short-term power loss or system maintenance
Unlike EEPROM modules, the 1785-MR requires battery power to retain data but allows fast read/write operations for PLC-5 applications.
Role in Industrial Automation
The 1785-MR module is critical for:
- Storing and protecting PLC-5 programs and configuration during power interruptions
- Providing fast-access memory for high-performance applications
- Ensuring rapid recovery after short-term power loss
- Supporting temporary backup during system maintenance or upgrades
Industrial Applications
Common applications include:
- PLC-5 based control systems in manufacturing plants
- Process automation requiring fast data storage and retrieval
- Industrial systems with intermittent power outages
- Backup memory for mission-critical automation processes
Installation and Usage
Installation steps:
- Insert the 1785-MR module into the designated memory slot on a compatible PLC-5 processor or rack
- Ensure the internal battery is functioning to maintain data integrity
- The module will store PLC programs and configuration during normal operation
- Replace the battery according to manufacturer recommendations to avoid data loss
Its compact design allows easy installation and maintenance.
Compatible System Components
- PLC-5 processors supporting CMOS RAM modules
- PLC-5 I/O racks
- Allen Bradley backup systems
- RSLogix 5 programming software
- Operator interface panels (HMIs)
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| Allen Bradley 1785-MR | CMOS RAM Storage Module | Battery-backed volatile memory | PLC-5 program and data storage |
| Allen Bradley 1785-ME64/A | EEPROM Memory Card | Non-volatile memory | High-capacity program storage |
| Allen Bradley 1785-ME32/A | EEPROM Memory Card | Medium capacity | Mid-to-large PLC-5 programs |
| Allen Bradley 1785-ME16 | EEPROM Memory Card | Standard capacity | Small PLC-5 programs |
Key Advantages
- High-speed memory for PLC-5 applications
- Battery-backed data retention during power interruptions
- Compact and easy to install
- Supports temporary backup and system recovery
- Reliable for industrial automation environments
Technical FAQs
How does CMOS RAM differ from EEPROM?
CMOS RAM is volatile memory that requires a battery for data retention, but it offers faster read/write performance than non-volatile EEPROM.
What is the typical battery life?
Battery life varies by usage and environmental conditions; check the module periodically to ensure memory retention.
Can it be used for long-term storage?
No, CMOS RAM is intended for temporary or high-speed storage; non-volatile EEPROM modules are better for long-term backup.
What happens if the battery fails?
Data stored in the 1785-MR module will be lost, so timely battery replacement is critical.
Conclusion
The Allen Bradley 1785-MR CMOS RAM Storage Module provides fast, battery-backed memory for PLC-5 programs and data, making it ideal for industrial applications requiring high-speed access and temporary backup. It complements EEPROM storage by offering rapid program read/write performance while ensuring data integrity during short-term power interruptions.