Introduction
Omron's CJ and CS series PLCs are widely deployed in manufacturing facilities across Asia, Europe, and the Americas. Known for their reliability and compact design, these controllers often remain in service long after Omron has transitioned to newer platforms like the NX/NJ series.
As the CJ1, CJ2, CS1, and CS1D series approach or reach end-of-life, sourcing spare parts is becoming increasingly challenging.
Commonly Discontinued Omron Components
- CS1 series — Older CS1G and CS1H CPUs and expansion modules approaching end-of-life.
- CJ1 series — CJ1G and CJ1M CPUs with older unit versions discontinued.
- C200H / C200HX — Fully discontinued legacy series, still widely installed in older facilities.
- Omron communication units — CS1W-ETN21 and similar Ethernet units with limited availability.
- Omron position control modules — NC series position controllers discontinued.
Compatibility Considerations
Omron PLCs have strict unit version compatibility requirements. When sourcing replacement CPUs or special function modules, the unit version must be compatible with your existing I/O configuration and program.
Always provide the unit version number (printed on the module label) when requesting a replacement to ensure compatibility.
Emergency Sourcing for Production-Critical Failures
When an Omron PLC failure causes immediate production stoppage, speed is critical. NORTHLINK maintains relationships with global surplus suppliers and can often locate hard-to-find Omron components within 24-48 hours.
Submit an urgent request through our Request a Quote page with your part number and required delivery timeline.