Why Part Numbers Matter When Ordering Automation Components

Two automation components can look almost identical yet have different specifications. A small change in a product code can indicate a different voltage rating, connection type, or configuration.

When machinery needs a replacement, those details matter. Ordering against an incomplete reference can delay repairs and create additional work for maintenance and purchasing teams.

Providing the full part number from the outset helps your supplier identify the correct component and reduces the risk of ordering delays.

A manufacturer’s part number or ordering code identifies a particular product or variant within its range. Depending on the component, sections of that reference can indicate electrical ratings, dimensions, communication interfaces or fitted options.

A product family name provides broader information. It may identify a range of drives or controllers without specifying the model you need for your installation.

Serial numbers serve a different purpose: they identify individual units. Include the manufacturer’s ordering reference in your enquiry, together with any serial number, hardware revision or firmware version shown on the label.

Letters and numbers at the end of a reference can be just as important as those at the beginning. Leaving off a suffix may remove information that distinguishes one version from another.

Copy the full code as printed, including separators and additional characters. Pay particular attention to easily confused markings, such as the letter O and the number 0.

When a label contains multiple references, a clear photograph helps your supplier determine which code applies.

An incorrect component creates more than a purchasing inconvenience. During installation, engineers may discover different terminals, unsuitable ratings or an interface that cannot communicate with existing equipment.

The original fault remains unresolved. Another search begins, delivery arrangements change, and maintenance work may need to be rescheduled.

Our article, The Part Failure Downtime Domino Effect, explores how an initial interruption can affect the wider operation. Checking specifications before purchase helps prevent an ordering mistake from extending that disruption.

Gathering a few details at the start can reduce follow-up questions and help your supplier assess the requirement:

• Record the manufacturer and complete part number. Check the component itself rather than relying solely on an old purchase record.
• Identify the equipment. Include the machine model or system details where available, particularly if the component is obsolete or its label is unclear.
• Photograph labels and connections. Capture readable markings, the overall unit and any separately labelled modules.
• Note hardware and firmware versions. These can affect compatibility, particularly with programmable equipment.
• Identify what you are replacing. Specify whether you need a complete assembly, an individual module or an accessory.
• Explain your requirements. Include quantity, delivery needs and whether new, used or refurbished stock would suit the application.

Store this information with the machine’s maintenance records and update it whenever components change. An accurate record makes future enquiries easier, especially when several people share purchasing responsibilities.

Older documentation may list a product that has since been withdrawn or replaced with a different reference. Knowing whether that change is a direct substitute or a newer design helps determine what installation work is needed.

A successor model might require an adapter, programming changes or different connections. Share details of the existing equipment and its application so these requirements can be assessed before ordering.

Withdrawal does not automatically rule out sourcing the original component. As discussed in Why Obsolete Doesn’t Always Mean Unavailable in Industrial Automation, specialist suppliers may still have suitable stock.

This gives you an opportunity to compare retaining the original specification with moving to an alternative, based on availability and the work involved.

At CJS Automation, our Part Identification Service helps customers identify and source automation components, including older and hard-to-find products.

Send our team the references you have, clear photographs and a brief description of your requirements. If a label has become difficult to read or you are unsure which code to use, we can help investigate.