Why Obsolete Doesn’t Always Mean Unavailable in Industrial Automation

Discovering that a critical automation part has become obsolete raises an immediate concern: what happens if it fails? For maintenance teams supporting older machinery, that question can quickly lead to discussions about replacing equipment.

But before committing to an upgrade, it helps to understand what that label actually means.

A manufacturer withdrawing a component does not mean every usable unit has disappeared. Stock may still be available, and replacing a single part could keep otherwise dependable machinery in service.

In industrial automation, a component is generally considered obsolete when its manufacturer discontinues the product or withdraws it from sale. Technical support, repairs and spare parts may remain available for a period afterwards, depending on the manufacturer.

Manufacturers retire older ranges as technology evolves, demand shifts or internal components become harder to source. Over time, access to manufacturer-supplied spare parts, software updates and technical assistance may become more limited.

For businesses maintaining established machinery, this creates a gap between how long equipment remains useful and how long its original components receive support. A production line could still deliver the required output even though its controller or drive has been withdrawn from sale.

Understanding that distinction matters. Obsolescence describes changes in product supply and support; it does not automatically make an installed part unsuitable.

Instead, it changes how you plan maintenance. Purchasing teams may need different sourcing routes, while engineers must consider which components require spares and which would benefit from a planned upgrade. Those decisions should reflect your machinery’s condition, production needs and expected remaining service life.

Product withdrawals can affect every area of an automation system. This includes:

• Motors
• CNC parts
• DC drives
• Encoders
• HMIs and displays
• Inverter drives
• PLC systems
• Process controllers
• Servo drives
• Soft starts

Specialist suppliers can help locate obsolete automation parts through several routes. Understanding these options gives you a clearer idea of what you are buying.

Unused Stock Held After Production Ends

Manufacturing may have stopped, but unused components can remain in supplier warehouses or surplus inventories. These units offer a way to replace an original part without moving to a different product range.

Used Parts Released Through Equipment Upgrades

When businesses upgrade or decommission machinery, working components may become available for resale.

Refurbished Units Restored for Further Use

Refurbishment provides another source of replacements. Depending on the supplier and the component’s condition, refurbishment may involve replacing faulty or worn elements, cleaning and testing the unit before it returns to service.

Ask what testing has been carried out and whether a warranty is provided.

Whichever route you choose, confirm the complete part number, hardware revision and firmware requirements before ordering.

Obsolescence becomes an operational problem when a failure takes longer to resolve than your business can tolerate.

Waiting for a replacement can leave machinery idle, delay customer orders, and put extra pressure on maintenance staff. In food production, an interrupted process can also put perishable materials at risk.

An alternative component might require programming changes, different connections or additional commissioning work, extending recovery beyond delivery.

For more information on how a part failure can cause disruption throughout an automation system, read our article on The Part Failure Downtime Domino Effect.

Manufacturer announcements provide the clearest evidence that a product is approaching withdrawal. Look for phase-out notices, final ordering dates and changes to repair or technical support arrangements.

Even without a formal withdrawal notice, the following signs may indicate that a component is becoming harder to source:

• Longer or inconsistent lead times: Routine orders become harder to fulfil through established channels.
• A replacement range appears: New models use different connections, software or communication protocols.
• Support becomes restricted: Firmware updates, programming tools or compatible accessories become harder to obtain.
• Supplier options narrow: Fewer businesses can confirm stock against your exact specification.

A suitable replacement may restore an otherwise capable machine without requiring a wider system change.

Consider a failed operator display. If a compatible unit can run the existing application and communicate correctly with its controller, replacing that display may be sufficient. Access to application backups and programming software will also influence how straightforward the switch becomes.

The same principle can apply to drive systems. Retaining a serviceable motor and sourcing its matching drive may be more practical than converting the installation.

There are limits, however. Repeated faults, unsupported software or several components becoming difficult to obtain can strengthen the case for modernisation. Compare the expected reliability and cost of continued maintenance with a planned upgrade, including installation and commissioning time.

You cannot control when manufacturers retire products. You can prepare for the consequences through spares planning, sourcing, and engineering decisions.

• Hold stock: Hold spares for components that cannot be obtained within an acceptable recovery period. Base quantities on installed numbers, failure history and planned equipment life. Follow storage guidance and check stock condition; keeping a unit on a shelf does not guarantee it will remain ready for use indefinitely.
• Contact specialist suppliers: Share specifications before an emergency occurs. This gives suppliers time to investigate suitable options and resolve identification questions while machinery remains accessible. Confirming a sourcing route early also reduces reliance on hurried decisions.
• Investigate repair options: If a replacement is difficult to source, check whether the existing component can be professionally repaired. The feasibility will depend on the fault, component condition and availability of replacement parts.
• Plan upgrades: A phased migration can spread costs and align work with scheduled shutdowns. Check how replacement hardware will interact with existing networks, software and devices before committing.

Our Guide to Industrial Maintenance Strategies provides broader context for deciding how these measures fit your maintenance approach.

At CJS Automation, we supply new and refurbished automation parts, including obsolete product lines, to help businesses keep existing equipment running.

If you are struggling to locate a component, contact our team with its full part code, photographs and any known revision details. Let us know whether you need an urgent replacement or are preparing spares for future maintenance.

Understanding your sourcing options gives you a stronger basis for deciding what comes next, whether that means replacing a single component or preparing for a carefully timed upgrade.