
( Brand: Allen Bradley ), ( Manufacturer Part Number: 1772ME ), ( Part Type: Module )
The **Allen-Bradley 1772ME (1772-ME/A) RAM Memory Module** is a high-performance, reconditioned memory expansion card designed specifically for the **Allen-Bradley PLC-5/400 series** programmable logic controllers (PLCs). This critical component serves as an essential extension of the PLC s internal memory, allowing users to significantly increase the storage capacity for ladder logic programs, data tables, and other control applications. Originally manufactured by Rockwell Automation, this memory module operates at a robust **5V DC** voltage level and features a **16-bit data bus interface**, ensuring seamless compatibility with the PLC-5/400 architecture. The **1772ME** is a **128K (128,000 bytes) RAM module**, providing ample space for complex control logic, trend recording, and real-time data processing ideal for industrial automation environments where reliability and scalability are paramount.
As a **reconditioned unit**, this memory module has undergone thorough testing and restoration to meet or exceed original specifications, ensuring it functions as reliably as a new part while offering a cost-effective alternative to purchasing a brand-new component. The module is housed in a **standard Allen-Bradley DIN-rail or backplane-mounted form factor**, making it easy to integrate into existing PLC-5/400 systems without requiring additional hardware modifications. Its **non-volatile RAM (NVRAM) backup** capability ensures that critical program data remains intact even during power interruptions, preventing costly downtime and data loss. This feature is particularly valuable in applications where continuous operation and data retention are critical, such as manufacturing, process control, or material handling systems.
The **1772ME** is designed for durability, operating within a temperature range of **0 C to 60 C (32 F to 140 F)**, making it suitable for a wide range of industrial environments, including those with moderate temperature fluctuations. Its **low-power consumption** further enhances its reliability in long-term deployments, reducing heat generation and minimizing wear on the PLC s power supply. Whether used to upgrade an existing system or as a replacement for a failed memory module, this reconditioned component delivers the performance and stability required for mission-critical automation tasks. For engineers and technicians maintaining legacy PLC-5/400 systems, the **1772ME** provides a dependable solution to extend memory capacity while maintaining full compatibility with Rockwell Automation s original hardware and software ecosystems.
### **Pros and Cons of Buying a Reconditioned Allen Bradley 1772ME (1772-ME/A) RAM Memory Module for a PLC**
#### **Pros:**1. **Cost Savings** Reconditioned modules are significantly cheaper than new ones, making them an attractive option for budget-conscious buyers. New 1772ME modules can cost hundreds of dollars, while reconditioned versions may be available for a fraction of that price.
2. **Functional Reliability** If properly tested and refurbished, a reconditioned module should perform identically to a new one. Reputable suppliers often include warranty coverage, ensuring basic functionality.
3. **Availability** Newer or discontinued PLC models may have limited availability for original components. Reconditioned modules help bridge this gap, allowing maintenance of legacy systems without waiting for replacements.
4. **Environmentally Friendly** Purchasing refurbished hardware reduces electronic waste compared to buying new, contributing to sustainability efforts.
5. **Quick Replacement** For critical applications where downtime is costly, a reconditioned module can be deployed faster than waiting for a new part, especially if sourced from a trusted supplier with inventory.
6. **Compatibility** The 1772ME is a standard memory module for older Allen Bradley (Rockwell Automation) PLCs (e.g., SLC 500, PLC-5, or MicroLogix). Since it is a direct replacement, no additional modifications are needed.
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#### **Cons:**1. **Uncertainty in Condition** Even with reconditioning, there is no guarantee that the module has not been damaged internally (e.g., from power surges, physical stress, or improper handling). Some suppliers may not disclose past issues like minor wear or failed components.
2. **Limited Warranty** Reconditioned modules often come with shorter warranties (e.g., 30 90 days) compared to new parts, which may lack the full manufacturer-backed support. If the module fails shortly after purchase, replacement or refund options may be restricted.
3. **No Original Documentation** Unlike new parts, reconditioned modules may not include original documentation (e.g., datasheets, firmware versions, or compatibility notes). This could lead to confusion during installation or troubleshooting.
4. **Potential for Counterfeit or Poorly Refurbished Units** Some sellers may misrepresent reconditioned modules as "new" or use parts that have been poorly repaired. Buying from untrusted sources increases the risk of receiving a faulty or incompatible unit.
5. **No Future Support** Rockwell Automation (now part of Emerson) no longer officially supports older PLC models like the PLC-5 or SLC 500. If issues arise, troubleshooting may rely on third-party forums or outdated resources.
6. **Risk of Compatibility Issues** While the 1772ME is a standard module, some older PLCs may have firmware or hardware quirks that cause intermittent problems. A reconditioned module might not resolve underlying system issues.
7. **No Upgrade Path** The 1772ME is a legacy module with no modern advancements (e.g., increased memory capacity, Ethernet/IP support, or security features). If the PLC is part of a larger system upgrade, this module may become obsolete quickly.
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### **Conclusion**
Buying a reconditioned **Allen Bradley 1772ME (1772-ME/A) RAM module** is a practical choice for maintaining or repairing older PLC systems when budget constraints or part unavailability are concerns. The cost savings and quick availability make it appealing for short-term needs, especially in industrial settings where downtime is costly.
However, the risks such as unreliable condition, limited warranty, and potential compatibility issues must be carefully considered. To mitigate these risks, **prioritize purchasing from reputable suppliers** that offer:
- **Detailed testing reports** (e.g., memory verification, functionality checks).
- **Warranty coverage** (preferably 1 year).
- **Clear return or replacement policies**.
- **Verification of authenticity** (e.g., matching serial numbers or part numbers).
If the module is for a **critical or long-term application**, weighing the trade-offs against the cost of a new module (if available) may be justified. For **non-critical or temporary use**, a reconditioned unit can be a cost-effective stopgap.
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### **Recommendation**
1. **For Budget-Conscious Buyers with Urgent Needs:**- Purchase from a **trusted supplier** (e.g., Rockwell Automation authorized reconditioners, specialized automation parts dealers, or well-reviewed online marketplaces).
- Request **proof of testing** (e.g., memory scan results, functionality verification).
- Consider adding a **short-term warranty extension** if possible.
- Use the module in a **non-critical or test environment** first to validate performance.
2. **For Long-Term or Mission-Critical Applications:**- Explore **new or remanufactured alternatives** if available, even at a higher cost.
- If reconditioned is the only option, **prioritize quality over price** and budget for potential replacement costs.
- Document the module s performance post-installation to assess reliability over time.
3. **For Legacy System Upgrades:**- If the PLC is part of a larger modernization effort, evaluate whether upgrading to a newer controller (e.g., CompactLogix, ControlLogix) would be more cost-effective in the long run, even if it requires additional programming effort.
Ultimately, the decision depends on **risk tolerance, budget, and the criticality of the system**. For most maintenance scenarios, a **high-quality reconditioned 1772ME module from a verified source** is a reasonable compromise.
Allen Bradley 1772-ME /A RAM Memory Module PLC.