How to Upgrade to ControlLogix 5570 in Legacy 1756 Racks
Upgrading Legacy Infrastructure: Installing ControlLogix 5570 Controllers in 1756-A10 Chassis
Upgrading industrial control systems often presents a dilemma between total replacement and incremental modernization. Many engineers ask if the modern ControlLogix 5570 series can function within the aging 1756-A10 chassis. This hardware compatibility is a cornerstone of Rockwell Automation’s “Integrated Architecture” philosophy. At Powergear X Automation, we frequently see facilities successfully breathe new life into old systems using this exact path.
The Technical Evolution of ControlLogix 5570 Series
The 5570 family, including the popular 1756-L71 and 1756-L73 models, represents a massive leap in factory automation power. These controllers utilize the Logix 5000 platform to deliver superior processing speeds and expanded memory capacities. Moreover, they handle complex motion control and high-speed communication better than their predecessors. Transitioning to the 5570 series allows users to leverage modern Studio 5000 features while maintaining a familiar hardware footprint.
Understanding the 1756-A10 Chassis Mechanics
The 1756-A10 serves as a 10-slot foundation for industrial automation modules. This chassis functions primarily as a passive backplane, providing mechanical support and electrical distribution. Since it contains no active logic processing, it remains remarkably versatile across different hardware generations. Consequently, the backplane focuses on routing data signals and power rather than limiting specific controller types.
Seamless Hardware Compatibility and Physical Integration
You can indeed install a ControlLogix 5570 controller into a 1756-A10 chassis without mechanical modifications. Rockwell designed the 1756 module form factor to remain consistent over decades. Therefore, the physical alignment and backplane connectors match perfectly between the new CPU and the legacy rack. This backward compatibility ensures that your existing physical investment remains valuable during a control systems migration.
Critical Pre-Upgrade Checklist for Power and Software
While the physical fit is guaranteed, successful integration requires careful planning of secondary factors. First, evaluate your current power supply, such as the 1756-PA75, to ensure it meets the 5570’s demands. In addition, you must upgrade your programming environment to Studio 5000 Logix Designer. Using outdated RSLogix 5000 versions will prevent you from accessing the advanced features of the L7 series.
Expert Insight: Powergear X Automation Technical Commentary
From our perspective at Powergear X Automation, the 1756-A10 remains one of the most reliable “workhorses” in the industry. However, we suggest checking the age of the backplane itself during the upgrade. If the chassis has been in a high-vibration environment for over 15 years, consider replacing it to prevent intermittent connection issues. Modernizing the CPU is an excellent cost-saving strategy, but the surrounding “passive” hardware must still be robust.
Technical Best Practices for Installation
- Verify the current draw for the 5570 CPU against the power supply limits.
- Confirm that all legacy I/O modules have compatible firmware for Studio 5000.
- Inspect the chassis backplane pins for signs of corrosion or bending.
- Ensure the enclosure cooling can handle the increased heat from faster processors.
- Update your system documentation to reflect the new hardware configuration.
Industrial Application Scenario: Food and Beverage Plant
Consider a large bottling facility using legacy 1756-L61 controllers in 10-slot racks. The plant experienced frequent “Watchdog” timeouts due to increasing logic complexity. By swapping only the CPU for a 1756-L73 in the existing 1756-A10 chassis, they reduced scan times by 40%. This approach avoided the massive labor costs associated with rewiring the entire I/O system or replacing the physical enclosure.
Frequently Asked Questions (FAQ)
Q: Can I keep my old 1756-A10 power supply when moving to a 5570 controller?
A: In most cases, yes. However, we recommend calculating the total mA draw of the new CPU and existing I/O modules. Newer CPUs sometimes draw more peak current during startup than older L6 models.
Q: Will my existing 1756-ENBT communication modules work with the new L7 controller?
A: Yes, they will communicate. However, the 5570 series pairs best with 1756-EN2T or EN3T modules to fully utilize the increased backplane data rates.
Q: Do I need to replace the battery when I switch to a 5570 series?
A: The 5570 series uses an 1756-ESMNSE or ESM cap module instead of a traditional lithium battery. This is a major maintenance advantage as it eliminates the need for periodic battery changes.
For more technical guides or to source high-quality ControlLogix components, visit the experts at Powergear X Automation. We provide the parts and expertise to keep your DCS and PLC systems running at peak performance.