CompactLogix vs ControlLogix: Key Differences

CompactLogix and ControlLogix are both Allen-Bradley Logix 5000 controllers, programmed in the same Studio 5000 Logix Designer software with the same tags and instructions. The difference is scale and architecture. CompactLogix 5380 is a compact controller with local Compact 5000 I/O for machine-level control, with up to 10 MB of user memory and 180 EtherNet/IP nodes. ControlLogix 5580 is a module in a 1756 chassis that scales to 40 MB and 300 nodes and adds controller redundancy for high-availability process and plant-wide systems.

Checked on 11 October 2026 against the sources listed under this post.

What is the difference between CompactLogix and ControlLogix?

CompactLogix is Rockwell Automation's compact Logix controller family for small and mid-size, machine-level applications. The current CompactLogix 5380 controller (Bulletin 5069) has its own power terminals and takes up to 31 local Compact 5000 I/O modules beside it, with no chassis. ControlLogix is Rockwell's chassis-based Logix family: the controller is a module that plugs into any slot of a 1756 chassis alongside I/O, communication, motion and redundancy modules, and several controllers can share one chassis while running independently.

Rockwell's own answer, on its CompactLogix family page, is that "the main difference lies in scale, flexibility and system architecture". The same FAQ describes CompactLogix as the more space and cost efficient option for machine-level and smaller systems, and ControlLogix as the choice for large, mission-critical systems that need more scalability, redundancy options and processing power.

In this short video, Rockwell Automation introduces the CompactLogix 5380 control system for smart machines. It is one of the lessons in our free Allen-Bradley GuardLogix Safety and CompactLogix 5380 course, and at about three minutes it is a quick way to hear how Rockwell itself positions the 5380 before you compare the numbers below.

CompactLogix 5380 vs ControlLogix 5580: the comparison

The figures below come from Rockwell's ControlLogix 5580 selection guide (October 2025) and its CompactLogix selection guide, cross-checked against the 5380 specifications.

Note the overlap. The largest CompactLogix 5380 (5069-L3100ERM: 10 MB, 180 nodes, 32 position-loop axes) is bigger than the smallest ControlLogix 5580 (1756-L81E: 3 MB, 100 nodes). So "CompactLogix vs ControlLogix" is rarely a question of raw size alone. It is a question of architecture: whether the system needs a chassis, legacy or third-party networks, several controllers on one backplane, or a standby controller that takes over after a fault.

Two limits are easy to miss. Rockwell's guide states that ControlLogix controllers enabled for redundancy do not support motion, and that their built-in Ethernet port is disabled, so a redundant system communicates through chassis modules. And on the CompactLogix side, only catalogue numbers with an M (or P) support Integrated Motion on EtherNet/IP.

CompactLogix vs ControlLogix vs GuardLogix: where safety fits

GuardLogix is the safety version of ControlLogix, and Compact GuardLogix is the safety version of CompactLogix. Each runs standard and safety logic in one Studio 5000 project. Rockwell's CompactLogix guide explains that during development, safety and standard logic follow the same rules (several programmers, online edits, forcing); once the safety system is validated and the safety signature applied, the safety logic cannot be modified.

Rockwell's selection guide says the GuardLogix system is type-approved and certified up to SIL 3 to IEC 61508 and PLe, Category 4 to ISO 13849-1. In practice the choice follows the standard controller: a machine that would use CompactLogix uses Compact GuardLogix, and a line or plant on ControlLogix uses GuardLogix. Our free GuardLogix safety course covers safety tasks, safety tags and the safety signature.

What about CompactLogix 5480 and ControlLogix 5590?

Two newer controllers blur the line further.

• CompactLogix 5480 runs Windows 10 IoT Enterprise in parallel with the Logix control engine, so third-party Windows applications sit in the controller. Rockwell lists 3 MB to 20 MB of Logix memory, 60 to 250 EtherNet/IP nodes and up to 150 CIP Drive position-loop axes on the largest model, still with no controller redundancy.
• ControlLogix 5590 is Rockwell's newest ControlLogix. Its product page lists up to 80 MB of memory, safety built into every variant, IEC 62443-4-2 compliance and Studio 5000 Logix Designer version 38. The 5590 user manual lists two 1 Gbps EtherNet/IP ports and 30 to 600 EtherNet/IP nodes (600 as the recommended maximum on the 1756-L980TS).

Older CompactLogix 5370 controllers are a migration question now: Rockwell's family page says some are discontinued and recommends moving to the 5380.

How to choose between CompactLogix and ControlLogix

1. Count EtherNet/IP nodes. A node is a device you add directly to the controller's I/O configuration. Up to 180 fits a CompactLogix 5380; beyond that you need ControlLogix.
2. Size the memory. 10 MB is the ceiling of the 5380 range. Large process applications, many alarms and big data structures push you to ControlLogix.
3. Decide on redundancy. If the process must ride through a controller fault, only ControlLogix offers controller redundancy.
4. Set the safety level. SIL 2/PLd or SIL 3/PLe decides whether you need a SIL 3 Compact GuardLogix or a GuardLogix with a safety partner.
5. Count servo axes. Compare your position-loop axis count with the 2 to 32 on CompactLogix 5380 models, and remember a redundant ControlLogix cannot run motion.
6. List every network. ControlNet, DeviceNet, SynchLink or third-party process networks need ControlLogix chassis modules.
7. Check the plant standard. Spares, existing 1756 racks and maintenance familiarity often decide close cases.
8. Validate the design. Rockwell recommends its Integrated Architecture Builder tool to lay out and check node counts.

On price, Rockwell does not publish prices on the pages we read, and prices vary by distributor and region, so we give none. Compare complete systems: a ControlLogix design includes a chassis, power supply and communication modules that a CompactLogix design does not.

Is the programming different?

No, and that is the main reason to learn the Logix platform. Both families use Studio 5000 Logix Designer, tag-based memory, the same instructions and the same four languages (ladder, structured text, function block and sequential function chart). A routine written for a CompactLogix moves to a ControlLogix project with changes to the I/O tree and module addresses, not a rewrite. What differs is the minimum Logix Designer version for each controller: version 28 to 30 for most 5380 models, 31 or 32 for Compact GuardLogix, 33 for ControlLogix 5580 redundancy and 38 for the 5590.

Our free Allen-Bradley Studio 5000 course teaches that shared workflow, and Allen-Bradley Studio 5000 Advanced goes into add-on instructions, structured programs and larger projects. For the wider route, read our Allen-Bradley PLC training guide. Logix Designer is licensed software; our guide to free Allen-Bradley PLC software and simulators explains what you can practise on without buying it.

Rockwell's smaller Micro800 controllers are a different platform, programmed in Connected Components Workbench rather than Studio 5000. If that is your starting point, try the Micro800 with Connected Components Workbench course and our first Micro800 ladder program. Working with Siemens as well? Our sister comparison, S7-1200 vs S7-1500, answers the same question for TIA Portal.

All of the learning is free. If you want proof of completion, the optional EDWartens Certificate of Completion costs US$8.99 for a beginner course; it is not a Rockwell Automation certification and not accredited, and anyone can check it at edwartens.com/verification.

Take the free course

Free

PLC programming · Beginner · Free

Allen-Bradley Studio 5000

Free

PLC programming · Intermediate · Free

Allen-Bradley Studio 5000 Advanced

Free

Safety · Intermediate · Free

Allen-Bradley GuardLogix Safety and CompactLogix 5380

Free

PLC programming · Beginner · Free

Allen-Bradley Micro800 with Connected Components Workbench