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What's the real-world difference between 'just-in-time' inventory and 'just-in-case' inventory when dealing with legacy PLC parts that could be discontinued any day?

ElizabethAllen

ElizabethAllen

2025-12-13

answer

Hey there! That's a really smart question - dealing with legacy PLC parts is a constant headache in industrial maintenance. Let me break down the real-world difference between these two approaches for you.

With just-in-time (JIT) inventory, you'd order those legacy PLC parts only when you actually need them for repairs or maintenance. This keeps your cash flow healthy and avoids tying up money in parts that might sit on shelves for years. The problem? If that part gets discontinued tomorrow and you need it next month, you're stuck scrambling to find it on the secondary market at inflated prices, or worse - facing production downtime.

With just-in-case (JIC) inventory, you'd stockpile those legacy parts while they're still available. You're basically buying insurance against future scarcity. Yes, it ties up capital and storage space, but when that critical PLC module fails at 2 AM and the manufacturer stopped making it five years ago, you'll have one ready to go. No downtime, no frantic searches, no production losses.

For legacy PLC parts specifically, most experienced maintenance managers lean toward a hybrid approach: JIC for mission-critical components that would cause catastrophic downtime if they failed, and JIT for less critical items. It's all about balancing the cost of inventory against the cost of potential downtime.

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