Machinery Control Panels
PLC Control Panels
Custom PLC control panels for industrial automation, machinery, HVAC, pump, process, and water treatment systems. Built to your I/O, sequence, HMI, VFD, wiring, and documentation needs.
Specifications
- Product Type
- PLC Control Cabinet / PLC Automation Control Panel / Electrical Control Panel
- Application
- Machine Automation, Process Control, Industrial Automation, Pump Control, Water Treatment, HVAC, Production Line Control
- Material
- Cold Rolled Steel / Stainless Steel
- Size
- 600 × 400 × 250 mm / 1800 × 800 × 600 mm / Customized
- Rated Voltage
- 220V / 380V / 400V / 415V / 24VDC / Customized
- Lock Type
- Cam Lock / Handle Lock Optional
- Communication Protocol
- Modbus RTU/TCP / Profinet / Ethernet IP / OPC UA Optional
- Control Power
- 24VDC / 110VAC / 220VAC / Customized
- Network Equipment
- Industrial Switch / Router / Gateway Optional

Custom PLC Control Panels for Industrial Automation, Machinery, Process, , and Water Treatment Systems
Uniregal supplies custom PLC control panels for industrial automation systems, machinery control, process control, pump control, HVAC systems, water treatment equipment, production lines, and OEM machines.
Each panel can be designed according to your control sequence, I/O list, field devices, PLC brand preference, HMI requirement, VFD control, communication method, enclosure environment, wiring standard, and project documentation needs.
For buyers, a PLC control panel is not only a cabinet with a PLC inside. It is the part of the system that connects sensors, motors, valves, drives, operator controls, alarms, and communication into one workable automation structure.
Quick Answer
A PLC control panel is an electrical control panel that uses a programmable logic controller to monitor input signals, process control logic, and control output devices.
It may include PLC hardware, HMI, VFDs, relays, contactors, circuit breakers, power supplies, terminals, communication modules, switches, indicator lights, safety relays, and field wiring connections.
The main value of a PLC control panel is that it can run automatic sequences, handle interlocks, display alarms, control motors or valves, communicate with other systems, and make industrial equipment easier to operate and maintain.
What a PLC Control Panel Usually Controls
Controlled Item | Typical Function |
|---|---|
Motors | Start/stop, interlock, overload protection, VFD speed control |
Pumps | Duty/standby logic, pressure control, level control, dry-run protection |
Valves | Open/close control, position feedback, sequence operation |
Sensors | Receives signals from pressure, level, flow, temperature, proximity, and limit switches |
VFDs | Controls speed for pumps, fans, conveyors, mixers, and process equipment |
Alarms | Displays fault, warning, abnormal signal, or process condition |
HMI Screens | Shows status, setpoints, manual/auto mode, alarms, and operating data |
Remote Systems | Communicates with SCADA, BMS, other PLCs, or plant-level systems |
Production Equipment | Runs machine sequence, timers, counters, interlocks, and safety logic |
Typical Applications
Application | PLC Control Scope |
|---|---|
Machinery Automation | Machine sequence, motors, sensors, HMI, safety interlocks |
Production Lines | Conveyors, stations, line interlocks, alarms, status monitoring |
Water Treatment | Pumps, valves, dosing, RO, UF, filtration, tank level, pressure protection |
HVAC Systems | Fans, pumps, dampers, valves, temperature and pressure signals |
Pump Systems | Duty/standby pumps, VFD control, pressure and level logic |
Process Control | Temperature, pressure, flow, level, pH, dosing, mixing |
Packaging Equipment | Conveyor control, sensors, counters, alarms, HMI operation |
OEM Equipment | Build-to-print or custom PLC panels for machine builders |
Retrofit Projects | Replacement of old PLC panels, obsolete PLCs, damaged wiring, unclear drawings |
PLC Control Panel Components
Component | Function |
|---|---|
PLC CPU | Executes control logic and manages I/O signals |
PLC I/O Modules | Connects sensors, switches, valves, relays, motors, and instruments |
HMI | Provides operator display, alarms, setpoints, and manual/auto controls |
VFD | Controls motor speed and supports soft starting or process adjustment |
Circuit Breakers / Fuses | Protects power and control circuits |
Contactors | Starts and stops motors or electrical loads |
Overload Relays | Protects motors from overload conditions |
Power Supply | Provides 24VDC or other control voltage |
Control Relays | Handles auxiliary logic, interlocks, and signal transfer |
Safety Relay / Safety Controller | Supports emergency stop and safety interlock circuits |
Terminal Blocks | Connects field wiring clearly and safely |
Communication Module | Supports Modbus, Profinet, Profibus, EtherNet/IP, Ethernet, or project protocol |
Push Buttons and Selector Switches | Supports local operation and manual control |
Indicator Lights | Shows power, run, fault, alarm, or status |
Wire Labels and Nameplates | Helps installation, troubleshooting, and maintenance |
PLC + HMI Control Panel
A PLC can run the control logic, but the operator still needs a clear way to see what is happening.
That is why many PLC control panels include an HMI. The HMI can display equipment status, alarm messages, setpoints, process values, manual controls, operating mode, production counts, and maintenance prompts.
HMI Function | Buyer Value |
|---|---|
Status Display | Operators can see what equipment is running or stopped |
Alarm Page | Faults are easier to understand and respond to |
Setpoint Input | Operators can adjust process values without changing PLC code |
Manual / Auto Mode | Supports commissioning, maintenance, and normal operation |
Trend or Data View | Helps monitor process changes when required |
Recipe or Parameter Page | Useful for machines with multiple product or process settings |
PLC + VFD Control Panel
A PLC + VFD control panel is used when the system needs both logic control and motor speed control.
This is common in pumps, fans, conveyors, mixers, HVAC systems, water treatment systems, and process equipment. The PLC decides when the motor should run and under what condition. The VFD controls motor speed, acceleration, deceleration, and feedback.
PLC Role | VFD Role |
|---|---|
Start/stop command | Motor speed control |
Interlock logic | Soft start and soft stop |
Alarm handling | Drive fault feedback |
Manual/auto mode | Frequency adjustment |
Process sequence | Pressure, flow, or speed control |
Communication | Parameter and status feedback |
PLC + SCADA Control Panel
For larger systems, the PLC control panel may need to communicate with SCADA or a plant-level monitoring system.
The PLC handles real-time control at the equipment level. SCADA can provide remote monitoring, alarm history, data logging, trend display, operator supervision, and plant-level visibility.
This is often used in water treatment plants, wastewater systems, utilities, process plants, energy systems, and large production lines.
Allen-Bradley, Siemens, Omron, Mitsubishi, and Other PLC Options
A PLC brand can be selected according to the buyer’s project standard, local maintenance preference, programming environment, budget, spare parts availability, and integration requirement.
Common PLC brand options include:
- Siemens
- Allen-Bradley
- Omron
- Mitsubishi
- Schneider
- ABB
- Delta
- LS
- Other equivalent brands according to project requirement
The best PLC brand is not always the most expensive one. It should match the machine complexity, I/O quantity, communication requirement, future maintenance, and what the buyer’s engineering team can support locally.
PLC Control Panel Wiring and Diagram Support
Wiring is one of the most important parts of a PLC control panel.
A good PLC panel should not only be wired correctly. It should also be easy to install, test, and troubleshoot. Clear terminal labels, wire numbers, I/O mapping, power separation, grounding, and cable routing can reduce commissioning problems at the site.
Available wiring-related documents may include:
- Power wiring diagram
- Control wiring diagram
- PLC I/O wiring diagram
- Terminal list
- Wire number list
- Field device connection diagram
- Network connection diagram
- Panel layout drawing
- Bill of materials
PLC Control Panel Design Considerations
Before production, the panel should be reviewed from the machine side, electrical side, control side, and maintenance side.
Design Item | Why It Matters |
|---|---|
Control Sequence | Defines how the system starts, stops, alarms, and responds to signals |
I/O List | Confirms sensors, switches, valves, motors, alarms, and feedback points |
PLC Brand | Affects programming, spare parts, communication, and future support |
HMI Requirement | Determines operator visibility and ease of troubleshooting |
VFD Requirement | Affects motor control, wiring, communication, and enclosure heat |
Communication | Defines connection with SCADA, BMS, other PLCs, or remote monitoring |
Power Supply | Affects breaker, fuse, transformer, and power supply selection |
Enclosure Environment | Indoor, outdoor, dusty, wet, hot, or corrosive areas need different cabinet choices |
Terminal Layout | Clear field wiring terminals reduce site installation mistakes |
Spare I/O | Future expansion becomes easier if spare points are planned early |
Documentation | Drawings and labels help installers and maintenance teams |
What Should Be Confirmed Before Ordering?
Information Needed | Example |
|---|---|
Application | Machine, water treatment, pump system, HVAC, process line |
Power Supply | 220V, 380V, 400V, 415V, 480V |
PLC Brand | Siemens, Allen-Bradley, Omron, Mitsubishi, Schneider, Delta |
I/O Quantity | Digital input, digital output, analog input, analog output |
Field Devices | Sensors, switches, valves, motors, VFDs, instruments |
Control Sequence | Manual/auto mode, interlocks, alarms, timers, startup/shutdown |
HMI Requirement | Screen size, alarm page, setpoints, recipe, status display |
VFD Requirement | Motor list, speed control, communication or hardwired control |
Communication | Modbus, Profinet, Profibus, EtherNet/IP, Ethernet, BACnet, hardwired I/O |
Enclosure Requirement | Wall-mounted, floor-standing, stainless steel, IP-rated, outdoor |
Component Preference | Siemens, Schneider, ABB, Omron, Mitsubishi, Allen-Bradley |
Documentation | Schematic, wiring diagram, I/O list, terminal list, BOM, test report |
Compliance Requirement | UL 508A-based design, IEC-based wiring, project-specific standard |
Build-to-Print or Custom PLC Panel Design
Uniregal can support both build-to-print and custom PLC control panel projects.
For build-to-print projects, the buyer provides approved drawings, BOM, PLC hardware list, I/O list, wiring diagram, and component requirements. We build according to the confirmed documents.
For custom design projects, the buyer provides the application, control sequence, I/O list, field device list, enclosure requirement, and preferred components. We help organize the PLC panel configuration before production.
Project Type | Suitable For |
|---|---|
Build-to-Print | OEMs, system integrators, repeat projects, approved drawings |
Custom Design | New machines, new process systems, incomplete drawings |
PLC Retrofit | Old PLC replacement, obsolete components, damaged cabinets |
Panel Upgrade | Add HMI, VFD, communication, alarms, or clearer wiring |
Design Optimization | Improve layout, labeling, terminal structure, maintenance access |
PLC Control Panel Testing Procedure
Testing should be planned according to the confirmed drawings and control scope.
Typical inspection and testing items include the following:
- Component model verification
- Mechanical assembly inspection
- Wiring continuity check
- Terminal and label inspection
- Grounding check
- Control voltage check
- PLC power-up check
- PLC I/O signal check
- HMI screen check when applicable
- VFD parameter and basic function check when applicable
- Alarm and interlock check according to agreed logic
- Communication check when applicable
- Visual inspection before packing
The purpose of testing is to reduce wrong wiring, missing labels, unclear I/O points, incorrect component models, and startup problems before the panel reaches the project site.
PLC Control Panel Price Factors
PLC control panel price depends on more than cabinet size.
The final cost is affected by PLC brand, I/O quantity, HMI requirement, VFD quantity, enclosure material, component brands, wiring complexity, communication modules, testing scope, documentation, compliance requirements, and delivery urgency.
A lower panel price may not be the lowest project cost if the I/O list is unclear, labels are missing, drawings are incomplete, or the panel needs modification during commissioning.
Retrofit and Replacement PLC Control Panels
Many PLC control panel inquiries come from existing equipment that still works mechanically but has outdated electrical controls.
The old panel may contain discontinued PLCs, damaged HMIs, obsolete relays, unclear wiring, missing drawings, or drives that are difficult to replace locally.
For retrofit projects, you can send old panel photos, the PLC model, the HMI model, an I/O list if available, wiring drawings, the machine nameplate, and a description of how the equipment operates. We can review the available information and suggest a practical replacement or upgrade configuration.
Engineering Documents
Available documents may include:
- General arrangement drawing
- Electrical schematic
- PLC I/O wiring diagram
- Terminal list
- Bill of materials
- PLC hardware configuration
- Network diagram if required
- HMI screen list if required
- Alarm list if required
- Nameplate and label list
- Test report
- Packing list
- Compliance-related documents if required
FAQ
What is a PLC control panel?
A PLC control panel is an electrical control panel that uses a programmable logic controller to receive input signals, process control logic, and control output devices such as motors, valves, relays, alarms, VFDs, and actuators.
What does a PLC control panel do?
It runs automatic control logic for machines, processes, pumps, HVAC systems, water treatment systems, and production lines. It can manage start/stop sequences, interlocks, alarms, I/O signals, HMI operation, and communication with other systems.
What is the difference between a PLC panel and a normal control panel?
A normal control panel may use simple relays, switches, and contactors. A PLC control panel uses programmable logic, so it can handle more complex sequences, I/O signals, alarms, communication, and future modifications.
What are the main components of a PLC control panel?
Common components include PLC CPU, I/O modules, HMI, VFD, circuit breakers, fuses, contactors, relays, power supplies, terminals, communication modules, safety relays, push buttons, selector switches, indicator lights, wire labels, and nameplates.
Can you build custom PLC automation control panels?
Yes. PLC control panels can be customized according to application, power supply, I/O list, control sequence, PLC brand, HMI requirement, VFD requirement, communication method, enclosure type, and documentation needs.
Can the PLC control panel include an HMI?
Yes. An HMI can be added to display system status, alarms, setpoints, manual/auto mode, parameters, process values, and operator controls.
Can the PLC control panel include VFDs?
Yes. VFDs can be integrated for pumps, fans, conveyors, mixers, and other motor-driven equipment that requires speed control, soft starting, or process adjustment.
Can the PLC panel connect to SCADA?
Yes. Depending on the project requirement, the PLC panel can support SCADA or remote monitoring through Ethernet, Modbus, Profinet, Profibus, EtherNet/IP, or other communication methods.
What information is needed for a quotation?
Please send the application, power supply, PLC brand preference, I/O list, field device list, control sequence, HMI requirement, VFD requirement, enclosure environment, communication requirement, and available drawings or photos.
Do you provide PLC control panel wiring diagrams?
Yes. Wiring diagrams can be provided according to the confirmed order scope. For custom projects, drawings should be reviewed before production to confirm power wiring, PLC I/O wiring, control wiring, terminals, and field connections.
Can you build a PLC control panel from my drawings?
Yes. We can support build-to-print projects if you provide approved drawings, a BOM, a PLC hardware list, an I/O list, a wiring diagram, and component requirements.
Can you replace an old PLC control panel?
Yes. For replacement projects, please send old panel photos, the PLC model, the HMI model, wiring drawings if available, a component list, voltage information, and a description of how the equipment operates.
How do you test a PLC control panel before shipment?
Testing may include component verification, wiring continuity check, terminal inspection, grounding check, PLC power-up check, PLC I/O signal check, HMI screen check, VFD basic function check, alarm and interlock check, communication check, and visual inspection before packing.
What affects PLC control panel price?
Price depends on PLC brand, I/O quantity, HMI size, VFD quantity, enclosure type, component brands, wiring complexity, communication modules, testing scope, documentation, compliance requirements, and delivery urgency.
Request a Quotation
Send us your application, PLC brand preference, I/O list, control sequence, field device list, HMI requirement, VFD requirement, voltage, enclosure requirement, and available drawings or photos.
Our team will review the PLC control panel configuration before quotation, so you receive a practical proposal based on the real automation requirement, not only a cabinet price.

Contact Us:
Email: info@uniregal.com
Website: www.uniregal.com