How do you identify if that 'vintage' Mitsubishi FX3U PLC on your legacy machine is genuinely obsolete vs. just discontinued, and what's your strategy for securing its replacement without halting production?

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Great question! Dealing with legacy PLCs can be tricky. Here's how to figure out your FX3U situation and plan your next move:

First, the difference between discontinued and obsolete:

• Discontinued means Mitsubishi has stopped manufacturing new units, but you can still find them through distributors, refurbishers, or the aftermarket. The FX3U series is in this phase - production has ended but parts are still available.

• Obsolete means no new units exist, repair parts are unavailable, and even Mitsubishi won't service them. The older FX2N series (discontinued in 2012) is now truly obsolete.

For your replacement strategy without production downtime:

1. Stock up now - Buy 2-3 FX3U units from reputable suppliers while they're still available. Keep them as emergency spares.

2. Plan your migration to FX5U - This is Mitsubishi's direct successor. While not a drop-in replacement, programs can be imported into GX Works3 software with some adjustments.

3. Consider a phased approach - Run the new FX5U system in parallel with your old machine during commissioning. This way you can test everything while keeping production running.

4. Work with automation specialists - They can help with the migration and ensure minimal downtime during the switchover.

The key is to act now while FX3U units are still available, giving you time to plan a smooth transition to the newer platform.

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