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ENGINEERING NOTE

ControlLogix or CompactLogix?

Controller selection is driven less by I/O count and more by network, motion, redundancy and safety architecture.

The engineering criteria that decide it

  1. I/O and network scale: Local + remote I/O count and EtherNet/IP node count set the capacity limits.
  2. Motion axes: Integrated motion axis count and synchronization needs (with Kinetix).
  3. Redundancy: Whether a ControlLogix/GuardLogix redundancy architecture is required for a continuous process.
  4. Safety level: SIL/PL requirements and the integrated safety scope of GuardLogix / Compact GuardLogix.
  5. System scale: A single machine (CompactLogix) or a multi-unit plant architecture (ControlLogix)?
  6. Expansion headroom: Capacity headroom for future I/O, network and motion expansion.
  7. Maintenance architecture: Chassis-based modularity versus a compact single unit; field service access.
  8. Software standard: Studio 5000 project standardization and alignment with the existing plant architecture.

A practical approach

At DS Robotik, controller selection is never made before the I/O list is drawn up and the motion and safety scope is clear. The right platform is the one that satisfies both current process behavior and the next 10 years of expansion.

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