What HMI size is best for a Custom Engineered Panel?

The best HMI size depends on operator density, available door space, and the amount of process data displayed. In Custom Engineered Panel assemblies, 7-inch and 10-inch units are common for compact machines, while 12-inch to 21-inch panels are preferred for process skids, MCC auxiliary sections, and plant-wide diagnostics. Selection should consider front IP rating, back-of-panel depth, operating temperature, and proximity to heat sources such as VFDs or power supplies. For IEC 61439 assemblies, the HMI must not compromise temperature-rise limits or enclosure protection. Many panel builders use industrial HMIs from Siemens, Schneider Electric, Rockwell Automation, and Weintek, matched to the PLC and network protocol used on site.

How do you integrate SCADA communication in a custom switchboard panel?

SCADA integration in a custom switchboard typically uses industrial Ethernet or serial communications routed through a managed switch, gateway, or industrial PC. Common protocols include Modbus TCP, Modbus RTU, Profinet, Ethernet/IP, and OPC UA. In IEC 61439 panel assemblies, communication devices should be segregated from power conductors and supplied from a stable 24 V DC control circuit, often backed by a UPS or monitored power supply. For reliable integration, specify switchgear and meters with native communication such as MCCBs with electronic trip units, multifunction energy meters, and protection relays. Proper labeling, IP addressing, and cybersecurity controls are essential for remote access and BMS/SCADA connectivity.

Do HMI and SCADA devices affect IEC 61439 temperature-rise compliance?

Yes. Although HMI and SCADA devices are low-power compared with ACBs or VFDs, they still add heat inside the enclosure and can affect compliance with IEC 61439-1 and IEC 61439-2 temperature-rise verification. Industrial HMIs, switches, panel PCs, and power supplies generate continuous losses that must be included in the thermal design. This is especially important in sealed enclosures, outdoor kiosks, and cabinets with poor ventilation. Panel builders often verify thermal performance using manufacturer loss data, derating curves, or validated software tools. If the internal temperature exceeds component ratings, consider forced ventilation, air-to-air heat exchangers, or separation into a communication compartment.

What communication protocols are most common for SCADA-ready panels?

The most common protocols for SCADA-ready panels are Modbus TCP, Modbus RTU, Profinet, Ethernet/IP, and OPC UA. In industrial facilities, Modbus remains widely used for meters, VFDs, and protection relays, while Profinet and Ethernet/IP are common where the PLC platform is Siemens or Rockwell-based. OPC UA is increasingly used for secure, vendor-neutral data exchange. For IEC 61439 Custom Engineered Panels, the protocol choice should align with the PLC, HMI, and plant SCADA architecture. Network switches should be industrial grade, DIN rail mounted, and suitable for the panel’s electromagnetic environment, with shielded cabling and proper earthing to minimize EMC issues.

Should the HMI be mounted on the door or inside the enclosure?

Most industrial HMIs are door-mounted for visibility, operator access, and reduced internal space consumption. Door-mounted units also improve maintainability and allow easy front-side protection ratings such as IP65 or IP66. Internal mounting is sometimes used for small status displays or in harsh environments where the front interface must be protected by an outer viewing window. In either case, the design must maintain the IEC 61439 assembly requirements for clearances, wiring segregation, and temperature-rise limits. If the panel includes MCCBs, VFDs, and network equipment, door-mounted HMI placement should avoid conflict with wiring ducts, gland plates, and structural reinforcements.

What power supply is recommended for HMI and SCADA equipment?

A regulated 24 V DC industrial power supply is the standard choice for HMIs, SCADA gateways, Ethernet switches, and PLC I/O interfaces. For critical applications, use a DIN rail power supply with sufficient current reserve, low ripple, and alarm contacts for DC undervoltage monitoring. Many panel builders add redundancy modules or a 24 V DC UPS to maintain logging and controlled shutdown during mains disturbances. In IEC 61439 assemblies, the supply should be coordinated with upstream protection devices and sized for inrush currents from HMI startup, industrial PC boot loads, and network equipment. Popular product families include Siemens SITOP, Phoenix Contact QUINT, and Omron S8VK.

How do you prevent EMC issues between SCADA devices and VFDs?

EMC problems are common when SCADA devices share a panel with VFDs, soft starters, and high-frequency switching equipment. Best practice is to separate control wiring from motor and drive output cables, use shielded Ethernet and signal cables, terminate shields correctly, and bond cable screens at the appropriate points. Install line reactors, EMC filters, and surge protection where required, and keep communication modules away from drive output zones. IEC 61439 design should support clean segregation and controlled routing. In severe cases, use a separate low-voltage control compartment or metal partitioning to improve immunity. Industrial-grade devices from Siemens, Schneider Electric, ABB, and Rockwell often provide better EMC robustness than consumer-grade electronics.

What standards apply to HMI and SCADA integration in custom panels?

The core standard for the panel assembly is IEC 61439-1 and IEC 61439-2, which govern design verification, temperature rise, dielectric properties, clearances, creepage, and short-circuit withstand. The connected switching and control devices typically follow IEC 60947, while hazardous-location considerations may invoke IEC 60079. If the assembly must withstand internal arc effects, IEC 61641 is relevant. For the SCADA layer, network and cybersecurity requirements are often guided by plant standards and IEC 62443 practices, even though that is outside the switchboard standard. A well-designed Custom Engineered Panel should document component ratings, communication architecture, thermal assumptions, and test evidence for the complete assembly.

Panel + Component

HMI & SCADA Systems in Custom Engineered Panel

HMI & SCADA Systems selection, integration, and best practices for Custom Engineered Panel assemblies compliant with IEC 61439.

Overview

HMI & SCADA Systems in a Custom Engineered Panel are no longer simple operator interfaces; they are the digital front end of the switchboard, integrating visualization, alarm handling, data logging, recipe management, and remote diagnostics into a coordinated IEC 61439 assembly. In practice, the panel may house an industrial touch HMI, an edge gateway, an unmanaged or managed Ethernet switch, an industrial PC, protocol converters, and interface modules for PLC, VFD, soft starter, or motor control centers. For demanding sites, these systems are often paired with power meters, protection relays, and communication-enabled breakers such as MCCBs or ACBs fitted with trip units supporting Modbus TCP, Profibus, Profinet, Ethernet/IP, or OPC UA connectivity. Selection for a Custom Engineered Panel must account for enclosure environment, electromagnetic compatibility, and thermal dissipation. Typical HMI selections include 7-inch to 21-inch TFT panels with front ingress protection up to IP65/IP66, rear IP20 or better, and industrial temperature ranges from 0 to 55°C or wider for harsh environments. Industrial PCs and SCADA gateways should be specified with adequate shock/vibration resistance, redundant storage where required, and 24 V DC supply tolerance with UPS support. When mounted inside compact cubicles, their heat load must be included in the panel temperature-rise calculation under IEC 61439-1 and IEC 61439-2, alongside losses from power supplies, network switches, relays, and control transformers. From a switchgear coordination standpoint, the HMI/SCADA subsystem does not carry fault current like a busbar or feeder, but it must remain functional or fail safely during normal and abnormal operating conditions. This means proper segregation from power cabling, use of shielded Ethernet and serial cables, bonding of cable screens, surge protection devices, and appropriate routing away from MCCB, ACB, and VFD output conductors. Where arc-risk is relevant, enclosure design may also consider IEC 61641 internal arc containment and separation forms such as Form 1 through Form 4 where applicable to control compartments and minimize disturbance during maintenance. In industrial applications, these systems commonly serve water treatment plants, HVAC plants, food and beverage lines, utilities, process skids, and building management systems. In hazardous locations, the communication architecture and any field components must also consider IEC 60079 requirements, while the low-voltage assembly itself remains governed by IEC 61439. For protective and control functionality, the surrounding apparatus should comply with IEC 60947 series requirements, especially IEC 60947-2 for circuit-breakers, IEC 60947-4-1 for contactors and motor starters, and IEC 60947-5-1 for control circuit devices. A well-engineered HMI and SCADA integration plan for a Custom Engineered Panel therefore includes network architecture, power segregation, thermal verification, EMC practices, time synchronization, remote access cybersecurity, and maintainability. The result is a panel that supports real-time diagnostics, safe operator control, and scalable plant integration without compromising the verified ratings of the IEC 61439 assembly.

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

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