A production line may run efficiently for several hours, then lose valuable production time when the team switches to another product. Changing a package size, adjusting a machine for a different component, entering new process settings or replacing tooling can interrupt production longer than planned. The problem becomes more costly when the plant runs several product variants each day and operators must repeat the same adjustments across multiple machines.
The solution is not always to purchase faster equipment or automate more production tasks. Manufacturers also need to examine how the equipment changes from one product to the next. Process automation services can help reduce avoidable setup work through better PLC programming, recipe management, equipment coordination and operator guidance. When these elements work together, the production team can switch products with fewer manual adjustments, more consistent settings and a clearer process for confirming that the next run is ready.
The hidden production loss between two products
Consider a Canadian manufacturer that produces three sizes of the same packaged product. The line runs steadily while producing one size, but switching to another requires several adjustments. An operator changes machine guides, enters new settings on an HMI, checks sensor positions, adjusts filling parameters and runs sample products before production can resume at the required quality level.
The production loss does not come from a single action. It builds up through repeated tasks, waiting for tools, checking settings, correcting entry errors and confirming that connected machines are ready. A change that takes a few minutes at one station may also delay downstream equipment, leaving conveyors idle and employees waiting for the next acceptable product.
This is why manufacturers should measure the complete changeover rather than focusing only on the time required to stop and restart a machine. A useful starting point is the time between the last acceptable product from the previous run and the first acceptable product from the next run. That measure includes setup activities and the time required to restore the required quality level, giving management a more realistic view of the production loss.
Three areas where changeover time gets lost
A changeover usually combines physical work, control system adjustments and product verification. Improving only one area may produce limited results when the other two continue to delay the next production run. A plant should examine the full sequence to identify which activities require equipment to stop, which can happen in advance and which can be simplified through automation.
Changeover area | Common source of delay | How automation can help | How to measure the result |
Physical setup | Repeated guide adjustments, tooling changes and manual alignment | Position indicators, suitable actuators and verified equipment settings | Minutes spent on physical adjustment |
Control settings | Operators entering values separately on several machines | PLC recipe handling and controlled parameter transfer | Time spent entering and checking settings |
Equipment coordination | Connected machines wait for manual confirmation or remain in the wrong operating state | PLC sequencing and status checks between machines | Waiting time between setup completion and production readiness |
Quality verification | Repeated sample runs and corrections before acceptable output | Recorded process values and consistent verification steps | Time from restart to first acceptable product |
Operator instructions | Staff rely on memory or inconsistent setup sheets | HMI guidance, prompts and clear confirmation messages | Number of setup errors and repeat adjustments |
The table highlights an important distinction: automating a production task is not the same as automating the transition between tasks. A robot may pack products efficiently once the correct format is loaded, yet the production line can still lose time while staff change its settings, verify its tooling and coordinate the next run. Flexible manufacturing depends on both reliable production and a controlled method for moving between product variants.
Find the delay before changing the control system
The first step is to observe an actual changeover from beginning to end. Record the activities performed by operators, the order in which machines stop and restart, the time spent waiting for tools or materials, and the checks required before acceptable production resumes. Speak with operators and maintenance personnel, because they often know which adjustments are unnecessarily repeated and which machine settings cause the most trouble.
Separate tasks that must take place while equipment is stopped from those that can be prepared in advance. The Lean Enterprise Institute describes this principle through Single Minute Exchange of Die, or SMED, a method for reducing setup time by separating internal tasks from external tasks and moving suitable work outside the machine’s stopped period. Automation may support this approach, but process observation should come first.
For example, an operator may currently wait until the previous production run ends before collecting the correct tooling, checking material availability and preparing the next product’s settings. Some of these tasks can be completed while the machine is still producing the previous product, provided the work can be performed safely and the necessary materials are available. The automation system can then coordinate the actual changeover once the line reaches the approved stopping point.
PRO TIP: Record several changeovers rather than relying on one unusually fast or slow run. Compare different operators, product formats and production shifts to distinguish a recurring system problem from an isolated event. This also helps establish a credible baseline against which the plant can measure improvements after an automation upgrade.
Use PLC programming to coordinate the transition
Programmable logic controller programming can help make changeovers more consistent by coordinating machine states, equipment interlocks, parameter changes and confirmation signals. Instead of relying on operators to remember the correct sequence across several stations, the control system can guide approved steps and confirm that required conditions are met before proceeding. The design must reflect the actual equipment, process requirements and safety controls.
Imagine a packaging line with a filler, label applicator and case packer. A change in package size may require adjustments at all three stations. When each machine has a separate manual setup process, an operator can complete one station while another remains incorrectly configured. PLC based coordination can help the system track setup status and identify which required conditions have not yet been met.
The control logic should not treat a command as proof that a physical adjustment has succeeded. A request to move a guide, for instance, is different from a confirmed signal that the guide reached its required position. Where suitable feedback devices are installed, the control system can verify the actual state and prevent the sequence from advancing until the agreed conditions are satisfied.
The engineering team should also consider how the program will behave during an interruption. A failed sensor, lost communication signal or incomplete adjustment should produce a clear response rather than leave the equipment in an uncertain state. Changes to control logic must be tested and documented, with safety functions kept separate and protected according to the machine’s design and applicable requirements.
Manage product recipes instead of entering every setting manually
A product recipe is a defined set of values used to configure equipment for a particular product or process. Depending on the application, it may contain speed settings, fill quantities, temperature targets, mixing times, positioning values or other approved operating parameters. Recipe management helps separate product configuration from the underlying control program, so the same equipment can process different products using controlled sets of values.
Without structured recipe handling, operators may need to enter the same information at several machine stations. A value can be missed, entered incorrectly or copied from an outdated setup sheet. These mistakes can cause extra adjustments, rejected products or equipment operation outside the intended process conditions. Recipe management can reduce these risks by storing approved settings and making the relevant values available to the control system.
Industrial recipe management solutions support consistent configuration and can improve record keeping across product runs. For example, AVEVA Recipe Management describes formula management and formula transfer as ways to improve setup consistency and support product changes. The specific functions available depend on the selected software, equipment and system architecture.
A well designed recipe process should include more than a list of saved numbers. It should identify the product, show the current approved version, check that required values fall within permitted limits and record the relevant user or system actions. The production team should also know how a recipe change is authorized and how the previous approved version can be restored when a change creates an unexpected result.
What should happen before a new recipe reaches the equipment?
The transition from the selected product to active production needs a controlled sequence. Selecting a recipe should not immediately change every machine setting without verification. The system should first confirm that the requested product is valid for the equipment and that the required conditions have been met, including any tooling, material, temperature, position or machine status requirements relevant to the process.
The exact checks will vary by industry. A mixing operation may need to verify ingredient quantities, tank availability and cleaning status, while a packaging line may need to confirm format tooling, sensor positions and label settings. The purpose is to catch configuration problems before they result in rejected products, equipment collisions or unsafe operating conditions.
A practical recipe validation sequence may include the following stages:
- Identify the product: Confirm the requested product code and the approved recipe version.
- Check readiness: Verify the relevant equipment state, materials, tooling and process conditions.
- Apply permitted settings: Transfer approved values to the appropriate machines and controls.
- Confirm the result: Use suitable feedback signals or operator checks to verify that settings have been applied correctly.
- Release production: Allow the next production stage to proceed only when the required conditions are satisfied.
- Record the transition: Store the product change, relevant settings and any required verification results.
These steps should be designed around the real process, not applied as a generic sequence to every machine. The control system must also respond properly when a check fails, with clear messages that explain what needs attention. This gives the operator a practical path to correct the problem without bypassing a required safeguard.
Where HMI instructions make a measurable difference
Even a well programmed PLC can leave operators guessing when the HMI provides unclear instructions. A screen may display dozens of parameters without showing which ones need attention for the selected product. Staff may need to move between screens, consult paper instructions or ask a maintenance technician to confirm the correct setup.
A more useful HMI can guide the operator through the agreed changeover sequence. It can display the selected product, show the required setup conditions, identify incomplete steps and indicate when the equipment is ready for the next action. This does not mean every operation should be automated or every decision handed to software. The interface should make the intended procedure clearer while preserving the operator’s role in checks that require human judgement.
For effective manufacturing process automation, screen design and control logic need to work together. The HMI should show the actual equipment state, not simply the last command issued. When a machine cannot complete a required movement, the screen should help the operator identify the reason rather than display a generic message such as “setup incomplete.”
A useful interface also supports training and consistency across shifts. New operators can follow the same approved process, while experienced staff have clearer information about current settings and faults. The plant should review the interface with the people who perform changeovers before release, then verify usability during testing with representative products and operating conditions.
Choosing between flexible automation and dedicated equipment
Flexible automation makes sense when a plant regularly produces different product variants and needs equipment to adapt to changing orders. The system may use configurable machine settings, reusable control logic, recipes and adjustable tooling to handle multiple formats. It can help a manufacturer reduce the need for repeated manual programming and make better use of a production line that serves a varied product range.
Dedicated equipment can be a better fit for stable, high volume production where the product changes rarely and the process needs to perform one task repeatedly. A dedicated machine may offer a simpler setup and a strong production rate for a narrow range of products. The financial case depends on how often changeovers occur, the cost of lost production time, the price of flexibility and the expected life of the equipment.
Decision factor | Flexible automation | Dedicated equipment |
Product range | Suited to several approved variants | Suited to a narrow, stable product range |
Changeover frequency | Useful when product transitions happen often | More attractive when changeovers are uncommon |
Setup requirements | Needs reliable recipe handling and validation | May need less product configuration |
Initial engineering | Can require more planning and integration | May offer a simpler design for a fixed task |
Future production changes | Can adapt within the limits of its design | May require substantial modification or replacement |
Best basis for approval | Cost of flexibility compared with recurring setup losses | Stable demand and a clear case for dedicated capacity |
The decision should reflect actual production needs. Flexible automation can become unnecessarily complex when the plant rarely changes products, while dedicated equipment may create a bottleneck when customers expect frequent variation and short production runs. An automation consultant can help compare the capital cost, changeover losses, product requirements, integration work and future operating plans before a manufacturer commits to either design.
How to measure changeover improvement after an upgrade
A changeover project should have a defined baseline and clear success measures before engineering work begins. Measuring only the time from machine stop to restart can hide delays that occur before the stop or after the first product emerges. A more complete measure starts with the last acceptable product from the previous run and ends with the first acceptable product from the next run.
The manufacturer should also track how consistently the new process performs across operators, shifts and product variants. A shorter average changeover may appear positive, but wide variation can continue to disrupt scheduling. The plant should check product quality and equipment behaviour alongside time savings so that faster setup does not come at the cost of additional defects or operating risk.
Measure | What it tells the manufacturer | How to track it |
Changeover duration | Time lost between consecutive product runs | Record the last acceptable product and first acceptable product times |
First pass yield after changeover | How often the next product meets requirements without correction | Compare accepted and rejected output during the initial production period |
Setup adjustment count | How much repeated correction is needed | Record manual changes, repeated entries and additional setup attempts |
Waiting time between stations | How much time equipment spends waiting for another stage | Review PLC status records or production observations |
Changeover time variation | How consistently the process performs | Compare results across products, shifts and operators |
Total production loss | The effect of changeovers on planned output | Combine verified setup losses with relevant production and quality data |
Consider an illustrative packaging line that currently takes 50 minutes to complete a product changeover. After the team improves preparation, introduces approved recipes and coordinates setup through the PLC, the average falls to 35 minutes. That saves 15 minutes per changeover, but the plant should confirm that the new process also maintains acceptable product quality, equipment behaviour and changeover consistency.
Suppose the line completes four such changeovers per day across 240 operating days each year. A reduction of 15 minutes per changeover represents 24 hours of recovered production time annually. This is a calculation from illustrative assumptions, not a claim about typical industry results or a guarantee that all recovered time becomes saleable output. The financial value depends on downstream capacity, customer demand, product quality and the plant’s ability to use the extra time productively.
A practical implementation plan for manufacturers
A changeover improvement project should begin with a defined production problem and move through observation, design, testing and measurement. Start by documenting the current method and identifying recurring delays. Then separate tasks that can be prepared in advance from work that requires stopped equipment, review the opportunities for recipe handling and PLC coordination, and define the checks needed before production restarts.
Before installation, agree on the target changeover measure and the conditions that must remain unchanged, including product quality, safety, equipment limits and required records. The engineering team can then develop the required PLC programming, HMI instructions and equipment interfaces. Testing should cover representative product variants, invalid recipe selections, incomplete setup conditions and appropriate recovery scenarios before the revised sequence is released for production.
Training and handover matter because operators and maintenance personnel will manage the system after the project ends. Provide updated instructions, explain the new sequence and document the approved recipe settings and relevant changes. After go live, compare actual performance against the baseline, investigate any unexpected losses and adjust the design through the plant’s approved change control process.
How ControlSoft Canada can support changeover improvements
ControlSoft Canada provides industrial automation engineering services involving PLC programming, control systems and process automation. For manufacturers experiencing recurring changeover losses, the first step is to examine how products move through the existing process, which settings need repeated adjustment and how the machines coordinate during a transition. That assessment can help define the control changes, operator functions and verification requirements needed for a practical improvement.
The proposed work should reflect the plant’s actual equipment and product range. A line using several PLCs may require coordinated settings across connected machines, while a batch process may need controlled recipe handling and confirmation of process conditions. The solution should also account for existing documentation, the production schedule, relevant safety requirements and the testing needed before the revised process is accepted.
ControlSoft Canada’s published project portfolio includes a colour and chemical processing project that involved PLC and SCADA programming, control documentation, commissioning and operator and maintenance training. The project illustrates the importance of connecting control engineering with testing and the needs of the people who operate the system. It does not establish a specific reduction in changeover time, so the potential benefits for a new project should be estimated and verified against that plant’s baseline.
For a plant considering flexible automation, the goal should be a well defined changeover process that is easier to repeat, simpler to verify and more reliable across product variants. Discussing the current process and its recurring delays with an automation engineering team can help establish the appropriate scope before committing to equipment or programming changes.
Frequently Asked Questions
Why do product changeovers reduce manufacturing throughput?
Changeovers interrupt production while operators adjust equipment, change tooling, enter settings and verify product quality. Delays grow when tasks are repeated, machines require separate adjustments or staff must correct errors after the line restarts. Measuring the full time from the last acceptable product to the first acceptable product of the next run helps identify the true production loss.
Which changeover activities can be automated?
Depending on the equipment and process, automation can support recipe selection, parameter transfer, equipment sequencing, position verification, operator prompts and recording of changeover data. Physical tooling changes may still require manual work, and some checks require trained personnel. The design should automate suitable repetitive tasks while preserving required safety controls and quality verification.
How can PLC programming reduce product changeover time?
PLC programming can coordinate connected machines, manage permitted parameter changes and verify required equipment states before the next step proceeds. It can also provide clear fault responses when a machine fails to reach its required condition. The amount of time saved depends on the current process and the specific delays the engineering changes address.
What is recipe management in manufacturing process automation?
Recipe management uses defined sets of approved parameters to configure equipment for different products or processes. It can reduce repeated manual entry and improve consistency between production runs. The system should control recipe versions, check relevant limits, apply settings to the correct equipment and record required changes or verification results.
When does flexible automation make more sense than dedicated equipment?
Flexible automation is worth assessing when production involves frequent product changes, several formats or changing customer requirements. Dedicated equipment may suit stable, high volume production with few changeovers. A sound decision compares capital cost, recurring setup losses, engineering complexity, expected product variation and the plant’s future operating plans.
What should manufacturers measure before and after a changeover improvement?
Track full changeover duration, first pass yield after the change, repeated adjustments, waiting time between machines and variation across operators or product types. Compare results against a representative baseline and keep quality and safety measures alongside time savings. This shows if the changeover process has become faster and more reliable.
Can automation eliminate all changeover time?
No. Some tasks still require equipment to stop, tooling to be changed, materials to be verified or quality checks to be completed. Automation can reduce avoidable manual work and improve coordination, but the practical goal is to remove unnecessary delays while maintaining the required product quality and safety controls.
Improve the Transition, Not Just the Production Speed
A production line can be fast while making one product and still lose substantial capacity during frequent changeovers. Manufacturers should examine how physical setup, control settings, machine coordination and quality verification affect the transition from one run to the next. Better preparation, structured recipes, well designed PLC logic and clear HMI guidance can reduce repeated work and make the process more consistent.
Effective Process Automation Services start with the real cause of the delay rather than a predetermined equipment purchase. By measuring current performance, defining the required operating conditions and verifying the results after implementation, manufacturers can make informed decisions about flexible automation. The aim is to help the plant move between products with fewer avoidable interruptions while preserving quality, safety and dependable operation.
