Executive Summary
Legacy equipment can remain mechanically productive long after its controls become difficult to maintain. Aging controllers, outdated operator screens, unavailable replacement parts, and undocumented programming can turn a manageable maintenance issue into an extended production interruption.
A controls upgrade offers an opportunity to extend equipment life, improve troubleshooting, and support future production needs. Success depends on understanding the existing machine, defining the desired results, and preparing the transition before production stops.
This paper proposes five steps:
Assess → Define → Engineer → Validate → Transition
Each step resolves questions that would otherwise surface during installation or startup, when changes are more disruptive.
1. Assess the Equipment and Capture Its Operating Knowledge
Start by documenting both the equipment and how people use it. Review the programmable logic controller (PLC), operator interface (HMI), drives, sensors, wiring, communications, software, and available spare parts. Confirm the condition of the machine’s mechanical and electrical systems to determine whether a controls upgrade is a sound investment.
Interview operators and maintenance personnel. Record recurring faults, manual workarounds, special operating sequences, and production requirements that may be missing from existing drawings or programs. Preserve available software backups, settings, and recipes, and identify anything that cannot be recovered.
An equipment and software lifecycle review also helps prioritize the most significant obsolescence risks.
Why this comes first: The installed equipment and its actual behavior establish the requirements for every later decision. Undocumented connections or operating sequences can otherwise become startup surprises.
How it simplifies the upgrade for the customer: Your team receives a clear picture of what can remain, what needs replacement, and which unknowns need investigation before committing to a project.
Key deliverable: An equipment assessment with a prioritized list of risks and upgrade recommendations.
2. Define Success and Agree on the Upgrade Plan
Translate the assessment into a written scope with measurable acceptance criteria. Identify the functions the machine must retain and the improvements the upgrade should deliver.
Typical goals include maintaining required production rates, preserving product quality, improving fault messages, simplifying changeovers, and using controls that the maintenance team can support.
Agree on the budget, responsibilities, production shutdown window, and installation sequence. Decide whether the work should occur during one shutdown or in stages. A staged approach can distribute work across several outages, but temporary connections between old and new systems may add complexity. The choice should fit the equipment and production schedule.
Why this follows the assessment: A reliable scope requires verified information about the machine. Selecting hardware too early can overlook dependencies or introduce unnecessary cost.
How it simplifies the upgrade for the customer: Production, maintenance, and management work toward the same outcome. Clear acceptance criteria reduce misunderstandings about when the project is complete.Key deliverable: An agreed scope, schedule, budget, and acceptance checklist.
3. Engineer the Controls Around Operation and Maintenance
Develop the hardware, software, and operator interface as one coordinated system. Confirm compatibility with any retained motors, drives, sensors, field wiring, and neighboring equipment.
Document how the machine should start, run, stop, respond to faults, and recover. Review migrated software against these requirements. Converting an old program does not by itself demonstrate that the new system will behave correctly.
Use consistent screen layouts, recognizable terminology, useful alarm messages, and clearly labeled components. Include safety requirements, network access controls, backup procedures, and future expansion needs in the design. Involve operators and maintenance personnel before finalizing it.
Why this happens before installation: Resolving design questions while the equipment is still producing is generally easier than resolving them during a shutdown.
How it simplifies the upgrade for the customer: Familiar workflows and clearer diagnostics help employees adopt the new controls. Standard components and complete drawings make future maintenance easier.Key deliverable: A reviewed controls design, operating description, and test plan.
4. Validate the System Before the Shutdown
Build and test as much of the new system as practical before installation. Use a factory acceptance test, a structured review before shipment or installation, to check the controls against the agreed requirements.
Test normal operating sequences, alarms, recipes, communications, and fault recovery. Where practical, simulate machine signals to uncover missing conditions or programming errors. Invite customer representatives to review operator screens and witness relevant tests.
Document which functions have been verified and which require testing on the actual machine. Confirm that hardware, installation materials, backups, and the startup team are ready before authorizing the shutdown.
Why testing comes before the production interruption: Early testing moves troubleshooting into a more controlled setting and reduces the number of unresolved issues carried into startup. Simulated testing supports, but does not replace, onsite verification.
How it simplifies the upgrade for the customer: Your team can review the system in advance and make informed decisions about installation readiness.Key deliverable: Recorded test results and an installation readiness checklist.
5. Install, Commission, and Transfer Ownership
Execute the installation using the agreed shutdown plan. Establish decision points and a recovery plan if startup takes longer than expected, including rollback where technically feasible.
Onsite, verify wiring, device signals, machine sequences, communications, and safety functions through the applicable commissioning and validation procedures. Run representative products or operating conditions and compare performance with the acceptance criteria.
Train operators and maintenance staff on normal operation, troubleshooting, backups, and recovery. Provide final drawings, software source files, licenses, settings, spare-parts recommendations, and support contacts. Schedule a follow-up review after the equipment has operated under normal production conditions.
Why this is the final step: The upgrade is complete when the machine meets agreed requirements and the customer can operate and maintain it confidently.
How it simplifies the upgrade for the customer: A structured handover gives your team the knowledge and resources needed to take ownership of the upgraded equipment.
Key deliverable: Accepted equipment, trained personnel, and a complete documentation and support package.
A More Predictable Path to Modernization
The value of this process lies in its sequence: understand the machine before defining the scope, define the scope before engineering, test before the shutdown, and verify performance before handover.
For Trola Industries customers, this creates a practical path toward more supportable equipment, clearer project decisions, and fewer surprises during the transition. The starting point is a focused equipment assessment that establishes where a controls upgrade can deliver the greatest value.
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