Allen-Bradley CompactLogix 5370 vs 5380: A Practical Guide

Allen-Bradley’s CompactLogix 5370 and 5380 are powerful PLCs. They control machines and processes in factories. Choosing between them depends on your project’s size, speed, and future needs. This guide compares them in simple terms.

Key Differences at a Glance

  • Generation: 5370 is the older series. 5380 is the newer, more advanced series.
  • Performance: 5380 controllers are generally faster and have more memory.
  • Features: 5380 offers more built-in features like dual Ethernet ports.

Processing Power and Speed

  • Scan Time: 5380 controllers execute logic faster. This is critical for high-speed machines like packaging lines.
  • Memory: 5380 controllers have much larger user memory. They can handle bigger, more complex programs.
  • Motion Control: The 5380 series has superior built-in motion instructions. It is better for coordinating multiple servo drives.

Connectivity and Networking

  • EtherNet/IP Ports:
    • 5370: Usually has one Ethernet port.
    • 5380: Typically has two Ethernet ports. This allows for device-level ring (DLR) networks or separate plant/device networks.
  • Integration: Both work well with HMIs and other devices. The 5380’s better processing helps manage large networks with less lag.

Durability and Environment

Both are built for industry, but the 5380 is tougher.

  • Temperature: 5380 controllers often have a wider operating temperature range. They handle hotter control cabinets better.
  • Vibration & Noise: The 5380 series has enhanced ratings for vibration and electromagnetic interference (EMI).

When to Choose a CompactLogix 5370

Choose a 5370 controller if:

  • You are maintaining or expanding an existing 5370 system.
  • Your application is medium complexity and does not require advanced motion.
  • Your budget is limited and a single Ethernet port is sufficient.
  • The operating environment is standard (not extreme heat or vibration).

When to Choose a CompactLogix 5380

Choose a 5380 controller for:

  • All new machine designs.
  • Applications needing fast processing and large memory (e.g., data logging, complex math).
  • Systems with multiple servo axes or coordinated motion.
  • Harsh environments or where network redundancy is important.
  • Future-proofing your investment for years of support.

Migration and Compatibility

  • Software: Both use Studio 5000 Logix Designer software.
  • Project Conversion: You can usually open a 5370 project and change it to a 5380 controller. The software will guide you. Check motion instructions and special modules.
  • I/O Compatibility: 5370 controllers use 1769 I/O. 5380 controllers use 5069 I/O. They are not physically interchangeable in the local chassis.

Frequently Asked Questions (FAQ)

Selection Questions

  • We need safety control. Which series should we use?
    Choose the 5380 series with GuardLogix. It combines standard and safety control in one compact controller. Not all 5370 models have integrated safety.

Performance Questions

  • Is the 5380 really worth the higher cost?
    For new systems, usually yes. The extra speed, memory, dual ports, and ruggedness provide long-term value and reduce future upgrade costs.

Technical Questions

  • Can I connect 1769 I/O to a 5380 controller?
    Not directly to its local chassis. However, you can connect a 1769 remote I/O rack over EtherNet/IP using a 1769-AENTR communication adapter.

For expert help selecting the right controller, visit Oiltech Controls Limited.