HMI & SCADA Systems in Custom Engineered Panel
HMI & SCADA Systems selection, integration, and best practices for Custom Engineered Panel assemblies compliant with IEC 61439.
HMI & SCADA Systems in a Custom Engineered Panel must be selected as part of the complete assembly architecture, not as isolated accessories. In IEC 61439-2 assemblies, the operator interface, PLC gateway, industrial PC, managed switch, remote I/O, and SCADA communication stack must be coordinated with the panel’s rated operational current, internal temperature rise, EMC environment, and fault withstand levels. For typical LV applications, the panel may incorporate ACBs, MCCBs, MCBs, motor starters, VFDs, and soft starters, while the HMI provides local control, alarm acknowledgement, process mimic display, and access to diagnostics. Integration quality directly affects availability in water treatment, HVAC plants, factories, utilities, gensets, and building automation systems. A robust design starts with enclosure classification and thermal analysis. HMI and SCADA hardware often require 24 VDC supplies, UPS-backed control circuits, panel heaters, fans, and filtered ventilation to maintain stable operation within manufacturer limits. In hotter environments, derating of touch panels, IPCs, and Ethernet switches is necessary to stay within the assembly temperature-rise limits of IEC 61439-1 and 61439-2. If the panel is installed outdoors, additional IP protection and sunlight-readable displays may be required, while hazardous-area interfaces may trigger IEC 60079 requirements for associated equipment and segregation. Communication architecture is equally important. Typical protocols include Modbus RTU, Modbus TCP, PROFINET, EtherNet/IP, BACnet/IP, and OPC UA for SCADA or BMS integration. Managed industrial switches, shielded cabling, proper grounding, and network segregation reduce nuisance trips and cyber-physical interference. For electrically noisy environments with VFDs and soft starters, EMC design should follow IEC 61439 guidance and the applicable drive and control equipment standards under IEC 60947. Surge protection, EMC filters, and separation of control wiring from power conductors improve reliability and minimize false alarms. In engineered panels, the HMI and SCADA layer should be coordinated with upstream and downstream protection devices, including ACBs for incomers, MCCBs for feeders, motor protection relays, overload relays, contactors, and relay logic for automatic transfer or load shedding. The short-circuit withstand of the control compartment, power supply protection, and any panel-mounted components must be compatible with the assembly’s declared short-circuit rating, whether 25 kA, 36 kA, 50 kA, 65 kA, or higher depending on the project. If the assembly is built as a form-separated design, internal segregation such as Form 2, Form 3, or Form 4 can help isolate the HMI/controls section from power circuits and improve maintainability. For process-critical sites, the HMI & SCADA package may also include redundant power supplies, mirrored network paths, historian interfaces, alarm event logging, and remote access gateways for maintenance personnel. Patrion, based in Turkey, designs and manufactures Custom Engineered Panel assemblies with IEC 61439 verification, ensuring the HMI and SCADA subsystem is coordinated with busbar ratings, component heat dissipation, dielectric clearances, and fault protection strategy. This approach is essential for reliable, maintainable, and standards-compliant low-voltage systems in modern industrial and infrastructure projects.
Key Features
- HMI & SCADA Systems rated for Custom Engineered Panel operating conditions
- IEC 61439 compliant integration and coordination
- Thermal management within panel enclosure limits
- Communication-ready for SCADA/BMS integration
- Coordination with upstream and downstream protection devices
Specifications
| Panel Type | Custom Engineered Panel |
| Component | HMI & SCADA Systems |
| Standard | IEC 61439-2 |
| Integration | Type-tested coordination |
Frequently Asked Questions
What should be considered when selecting an HMI for a Custom Engineered Panel under IEC 61439?
The HMI must be selected as part of the complete assembly verification, not only by screen size or software features. Key factors include supply voltage, heat dissipation, enclosure ambient temperature, IP rating, EMC performance, and compatibility with the panel’s internal wiring layout. Under IEC 61439-1 and 61439-2, the HMI’s thermal contribution and mounting arrangement must not compromise the assembly’s temperature-rise limits or dielectric clearances. For industrial use, 24 VDC HMIs, panel PCs, and gateways are common. If the panel includes VFDs or soft starters, EMC filtering and cable segregation become essential to preserve communication stability.
How is SCADA integration implemented in a custom low-voltage switchboard?
SCADA integration typically uses an industrial communication layer built around PLCs, remote I/O, managed Ethernet switches, and protocol gateways. Common protocols include Modbus TCP, Modbus RTU, PROFINET, EtherNet/IP, BACnet/IP, and OPC UA depending on the plant and BMS architecture. In a custom engineered panel, the SCADA system should be coordinated with the control power supply, network topology, surge protection, and grounding scheme. IEC 61439 requires that all devices be installed so the assembly remains verifiable for temperature rise, short-circuit withstand, and protection against electric shock. Good practice also includes event logging, alarm prioritization, and remote diagnostics.
Does an HMI add heat load to an IEC 61439 panel enclosure?
Yes. HMIs, industrial PCs, switches, and power supplies contribute to the internal heat balance of the enclosure and must be included in thermal calculations. This is especially important in compact Custom Engineered Panels with ACB incomers, MCCB feeders, VFDs, or soft starters, where total losses can be significant. IEC 61439-1 and IEC 61439-2 require that temperature-rise limits are not exceeded for devices, terminals, and accessible surfaces. In practice, designers may use ventilation, air conditioners, heat exchangers, panel fans, or heat sinks, and may relocate higher-loss equipment to lower-temperature zones inside the cabinet.
What short-circuit rating is required for a panel with HMI and SCADA equipment?
The required short-circuit rating is the assembly’s declared withstand level, not the HMI’s individual rating. The control components must be protected so they survive the prospective fault level of the installation, commonly 25 kA, 36 kA, 50 kA, 65 kA, or project-specific values. Under IEC 61439-1/2, the panel builder must verify short-circuit withstand capability through design rules, calculation, or testing. HMI, PLC, switches, and 24 VDC power supplies should be protected by appropriately rated MCBs, fuses, or current-limited supplies, and mounted to maintain clearances and segregation from power busbars and feeder circuits.
Which IEC standards apply to HMI and SCADA in custom panel assemblies?
The primary standard is IEC 61439-1 for general rules and IEC 61439-2 for power switchgear and controlgear assemblies. If the panel includes distribution functions, IEC 61439-3 and IEC 61439-6 may also be relevant depending on the assembly type and site use. The installed components themselves are typically evaluated under IEC 60947 for low-voltage switchgear and controlgear. If the system uses hazardous-area interfaces, IEC 60079 becomes relevant, and if arc-flash containment or mitigation is required, IEC 61641 may apply to internal fault testing or design strategy. A compliant panel must coordinate all these standards at the system level.
Can HMI and SCADA be used with VFDs and soft starters in the same panel?
Yes, and this is a very common configuration in industrial panels. The HMI can display drive status, faults, setpoints, and energy data from VFDs and soft starters via Modbus, PROFINET, or other supported protocols. The design must account for EMC, since drives generate conducted and radiated interference. Separation of power and control wiring, shield termination, EMC filters, and proper earthing are important. Under IEC 61439 and IEC 60947, coordination with overload protection, motor protection relays, and feeder devices must be maintained so the control system remains stable during switching and fault conditions.
What panel layout is best for an HMI and SCADA section in a custom control cabinet?
The best layout places the HMI at ergonomic viewing height on the door, with the PLC, power supplies, network switch, and I/O modules mounted in a cooler, segregated control zone away from high-loss devices such as VFDs, ACBs, or large MCCBs. Form separation can be used to isolate the control compartment from power circuits, reducing heat transfer and improving maintainability. Cable ducts should keep communication cables separate from power wiring, and spare DIN rail capacity should be reserved for expansion. This approach improves serviceability and supports IEC 61439 verification for temperature rise and internal segregation.
How do you ensure reliable remote monitoring from a custom panel HMI/SCADA system?
Reliable remote monitoring depends on both hardware design and software architecture. Use industrial-grade switches, stable 24 VDC power supplies, UPS backup for control circuits, and a secure gateway for remote access if needed. Alarm buffering, time-stamped event logs, and local HMI fallback are important if the network fails. For critical installations, redundant communication paths or mirrored SCADA servers may be justified. The panel builder should also ensure that the communication subsystem is coordinated with the assembly’s thermal design, EMC measures, and IEC 61439 protection strategy so the system remains stable in long-term operation.