Every one to two months, a local paper products manufacturer was facing the same problem: their automatic stapler and folding machine would stop, production would come to a standstill, and troubleshooting could take days.
When the fault involved an obsolete component that had to be sourced from overseas, the machine could remain unavailable for one to three weeks.
For a manufacturer working against tight delivery schedules, that downtime can mean delayed production, missed commitments and lost orders.
The problem: good mechanics, obsolete controls
The machine was approximately 15 years old and had been purchased as a used unit. Mechanically, the stapling and folding assemblies were still serviceable.
The weak point was the control system.
It relied on a proprietary OEM control board for which replacement parts were becoming increasingly difficult to source. The original touchscreen also provided very limited information to the operator and maintenance team.
When the machine stopped, there was little indication of what had actually gone wrong.
Maintenance often had to open the electrical cabinet, trace signals and wiring manually, identify the suspected faulty component, and then determine whether a replacement was still available.
The machine might only require one failed component, but identifying and obtaining that component could keep the entire production line idle for days or weeks.
Why we chose retrofit instead of replacement
We started by asking what was making the machine unreliable.
Before recommending a retrofit, we considered the condition of the mechanical assemblies, motors, actuators, sensors, electrical system, original control architecture and the availability of replacement components.
The mechanical platform remained usable. Rather than discard serviceable equipment, we focused the retrofit on the control layer.
What we changed
The original control system was removed and the machine was migrated to a modern PLC and HMI architecture.
The new PLC now handles the main machine sequence, including the stapling and folding cycles, sensor interlocks, actuator commands and relevant operating logic.
A new HMI touchscreen gives the operator a clearer interface for machine operation, recipe selection, machine status, cycle information and fault diagnostics.
Where practical, the existing motors, mechanical assemblies and actuators were retained.
This kept the budget focused on the machine’s main reliability risk.
Before and after
| Before retrofit | After retrofit |
|---|---|
| Proprietary OEM controller | Standard PLC-based control |
| Limited touchscreen information | Modern HMI with live machine status |
| Manual troubleshooting by tracing signals | Fault and I/O diagnostic information |
| Obsolete or difficult-to-source control parts | Supportable industrial components |
| Limited visibility into machine sequence | Clearer operating and maintenance information |
| Fixed original control architecture | Maintainable and modifiable PLC program |
The machine still performs the same fundamental stapling and folding process. What changed is how the machine is controlled, diagnosed and maintained.
Troubleshooting changed dramatically
With the PLC and HMI system, maintenance personnel can now see much more clearly where the machine sequence has stopped and which input, sensor, actuator or condition is preventing the next step.
Instead of investigating the entire control circuit, the technician can focus on the affected area.
Sensors, motors and mechanical components can still wear out. The difference is that the machine now provides useful information when something goes wrong.
The recurring control-system problems that originally prompted the retrofit have not repeated since commissioning.
And when maintenance is required, the system no longer depends on the same obsolete proprietary control hardware.
From weeks of downtime to hours
Before the retrofit, certain failures could leave the machine unavailable for two to three weeks when diagnosis and overseas spare-part sourcing were involved.
After modernisation, typical control-related troubleshooting can often be completed within approximately one to two hours because the fault can be identified much more quickly and the control platform uses more readily supportable industrial components.
The value is making an ageing machine maintainable again.
When does an old machine make sense to retrofit?
A control retrofit can be attractive when the machine's mechanical structure is still in good condition but its PLC, controller, HMI, drives or proprietary electronics are obsolete or difficult to support.
It is less attractive when the machine also suffers from major mechanical wear, structural problems, excessive backlash, damaged motion systems or when the production process itself needs to change substantially.
A proper assessment should determine whether retrofit or replacement makes more economic sense.
What does a PLC + HMI retrofit cost in Malaysia?
For a machine in a similar complexity class to this project, a typical budget may be around RM12,000–RM25,000.
Actual cost depends heavily on I/O count, motion axes, drives, safety requirements, existing documentation, machine condition and how much of the original sequence must be reverse-engineered.
Compare that budget with the cost of an idle line, missed production and delayed orders.
Have an ageing machine with an obsolete controller?
Send Rey Technology a few photos of the machine, control cabinet and operator panel together with a short description of the recurring problem.
We can provide an initial assessment of whether PLC + HMI modernisation is technically sensible before moving to a detailed site assessment.