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When your 15-year-old Mitsubishi Q-series PLC gets discontinued, do you: A) Stockpile every module you can find, B) Attempt a risky migration to a new platform mid-production, or C) Develop a Frankenstein hybrid system using protocol converters?

JoshuaParker

JoshuaParker

2025-12-11

answer

Ah, the classic industrial automation dilemma! When your trusty 15-year-old Mitsubishi Q-series PLC gets discontinued, it's like finding out your favorite tool is being phased out. Let me break down your options:

A) Stockpiling modules is tempting - it feels like buying insurance. But here's the reality: you're just kicking the can down the road. Eventually, those modules will fail or run out, and you'll face the same problem with even older, harder-to-find parts. It's a short-term fix that creates a long-term headache.

B) The risky mid-production migration sounds scary, but with proper planning, it doesn't have to be. Mitsubishi actually offers migration tools and conversion adapters that let you reuse your existing programs on newer iQ-R/Q series CPUs. The key is doing it in phases - not all at once. Start with non-critical systems first.

C) The 'Frankenstein' hybrid approach with protocol converters is actually more common than you'd think! These converters act as translators between old and new systems, letting you gradually upgrade while keeping production running. It's not as messy as it sounds - many companies use this as a stepping stone to full migration.

My advice? Don't panic-buy modules. Instead, create a phased migration plan using Mitsubishi's official upgrade tools. Start with protocol converters for critical systems, then gradually replace components during scheduled maintenance. This gives you the best of both worlds: continued operation and a path to modern, supported hardware.

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