Custom controls companies specialize in creating automation solutions when production demands exceed what packaged systems offer. They work with PLCs, HMIs, SCADA systems, motion controllers, and safety networks to build control architectures that match exact operational needs. This article explores what these companies do, the services they provide, which industries depend on them, when custom controls make sense versus off-the-shelf options, and how to choose the right partner.
Key Takeaways
- Custom controls companies build PLC, HMI, SCADA, and motion systems when off-the-shelf packages fall short
- Scope covers design, programming, legacy integration, commissioning, training, and long-term support
- Automotive, food, and pharma use them for precision, compliance, and multi-machine coordination
- Choose custom when you need specialized capability, audit-ready documentation, or flexible integration
- Vet partners on platform expertise, industry track record, acceptance testing, and post-install support
What Is a Custom Controls Company?
A custom controls company is an engineering firm that designs, programs, integrates, and supports industrial control systems tailored to specific manufacturing processes. These companies work with control hardware and software (PLCs, HMIs, SCADA systems, motion controllers, variable frequency drives) to create automation solutions that precisely match operational requirements.
Some firms focus exclusively on controls engineering. Systems integrators like GLOBAL Automation Technologies deliver controls as one component of complete turnkey automation systems that include robotics, material handling, and mechanical design.
GLOBAL's controls engineers develop the control logic that coordinates robots with production equipment, conveyor PLCs, vision systems, and safety networks, then integrate those controls into functioning manufacturing cells.
Typical project lifecycle:
- Assessment and requirements gathering
- Control system architecture design
- Hardware specification and procurement
- Software development and PLC/HMI programming
- Integration with existing equipment
- Testing and validation (FAT/SAT)
- Commissioning and production launch
- Operator training and documentation
- Ongoing support and optimization
Most custom controls companies specialize in specific control platforms (Rockwell/Allen-Bradley, Siemens, Mitsubishi, Omron, or Beckhoff) and specific industries where they've built deep application expertise. GLOBAL, a Level 5 FANUC Authorized System Integrator, for example, focuses on FANUC robotic systems and automotive manufacturing, applying controls knowledge across welding, painting, dispensing, and assembly applications.
Modern custom controls go beyond traditional control logic. Common additions include:
- IIoT connectivity and plant-floor data analytics
- Predictive maintenance tied to live equipment data
- MES/ERP integration for production visibility
- Open interfaces such as OPC UA for enterprise connections
- Modular controllers that support selective upgrades
Core Services Offered by Custom Controls Companies
Control System Design and Engineering
Companies assess production requirements and design control architectures specifying hardware components, control logic flow, and system integration points. Design deliverables typically include:
- Electrical schematics and panel layouts
- Network topology and communication architecture
- Functional specifications for control logic
- I/O module configurations
- Safety system design
ISA-5.1 establishes uniform instrument symbols and identification for process diagrams, providing a standardized framework for design documentation.
PLC and HMI Programming
Engineers develop custom control logic using ladder logic, structured text, or function blocks defined by IEC 61131-3. Programming handles:
- Machine sequencing and process control
- Safety interlocks and emergency stop coordination
- Production coordination across multiple machines
- Recipe management and process parameters
GLOBAL's controls engineers write this logic for robotic systems, managing robot-to-machine communications, conveyor tracking, and fault handling.
HMI development creates operator interfaces with real-time process visualization, alarm management, and data logging through touchscreen controls.
System Integration and Installation
Physical integration work includes control panel fabrication, field wiring, sensor and actuator installation, and network infrastructure setup. Integration connects new control systems with existing factory equipment, including robots, conveyors, inspection systems, and legacy PLCs.
Turnkey providers like GLOBAL deliver this integration as part of complete manufacturing cells where controls coordinate robotics, vision systems, and mechanical handling equipment. For example, in machine tending applications, controls manage robot loading, door operation, machine-cycle initiation, and intelligent scheduling across multiple CNC machines.
Commissioning, Testing, and Validation
ISA-105/IEC 62381 governs acceptance testing and commissioning practices. Engineers verify control logic, test safety systems, validate process sequences, and tune motion parameters through:
- Factory Acceptance Testing (FAT) at the vendor site
- Site Acceptance Testing (SAT) after installation
- Functional verification against specifications
- Safety system validation
- Performance tuning
In regulated industries like pharmaceuticals and food processing, commissioning includes extensive documentation, validation protocols, and compliance verification. GLOBAL validates processes before production begins. That means before a single weld hits steel in robotic welding cells, or before paint reaches automotive body panels.
Training and Ongoing Support
Operator training teaches production staff to run systems, respond to alarms, adjust process parameters, and perform basic troubleshooting. Ongoing support services include:
- Remote monitoring and diagnostics
- Troubleshooting and emergency repair
- System optimization
- Software updates and modifications
Rockwell describes a 24-hour follow-the-sun managed-services model for continuous support. GLOBAL provides training, technical documentation, and ongoing support as part of its turnkey integration services, with AI-driven health assessments flagging equipment issues before they cause downtime.
Industries That Rely on Custom Controls Companies
Automotive and EV Manufacturing
Automotive and EV plants need precise coordination of robots, conveyors, and inspection systems under tight cycle-time and quality targets:
- Body welding lines with multi-robot coordination
- Paint systems with film-build control to ±1 micron accuracy
- Powertrain assembly with CNC machine tending
- EV battery production spanning electrode manufacturing through pack assembly
- Final assembly with pick-and-place, fastening, inspection, and traceability
Siemens reported one lithium-battery equipment manufacturer achieved 30% less onsite commissioning time and 20% lower overall cost using simulation to design and validate production equipment before installation.
Food and Beverage Processing
Food and beverage lines need controls that support FDA compliance, recipe management, hygiene standards, and lot traceability:
- Automated packaging and filling systems
- Cooking and pasteurization with tight temperature control
- Material handling built to sanitary design standards
21 CFR 117.40 requires food-production equipment to be adequately cleanable, properly maintained, and designed to prevent adulteration. FDA's Food Traceability Rule (compliance date July 20, 2028) also requires Key Data Elements for receiving, shipping, and transformation events, with records available to FDA within 24 hours.
Pharmaceuticals and Medical Devices
Pharmaceutical and medical-device makers run cleanroom processes that demand rigorous validation:
- Filling and packaging lines with batch control
- Sterilization processes with validated cycles
- Inspection systems with 100% verification
Controls must also support 21 CFR Part 11 for electronic records—system validation, controlled access, time-stamped audit trails, and documentation with revision history.
Custom Controls vs. Off-the-Shelf Solutions
Off-the-shelf solutions work well for:
- Standardized processes with bounded sequences
- Simple machine control with modest I/O
- Single-purpose equipment
- Applications where proven packaged solutions exist (standard CNC controllers, basic conveyor controls)
In those cases, a PLC is often enough—robust, simple, and well suited to standalone machines with limited external interfaces.
Custom controls become necessary when:
- Complex multi-machine coordination is required
- Integration with diverse legacy equipment is needed
- Unique process requirements don't fit standard offerings
- Regulatory compliance demands specific control logic and documentation
- Control logic must stay flexible for continuous improvement on the plant floor
Multi-vendor lines tied into SCADA, MES, or ERP—and held to plant-specific standards—need open protocols, modular hardware, and data flows built for that environment.
Trade-offs to consider:
- Higher upfront engineering cost and longer development timelines than packaged options
- Precise fit to the process, with room to change logic as production evolves
- Cleaner integration with existing factory systems than forcing a standard package to fit
- No paying for unused features—or shipping without capabilities you actually need
That trade-off matters more as plants keep investing: the U.S. industrial automation and control systems market was valued at $47.04 billion in 2024 and is forecast at $51.63 billion in 2025.
How to Choose the Right Custom Controls Company
The right custom controls partner has to own your platform stack, industry constraints, and startup schedule—not only the design package. Use the checks below to compare firms on proof, not promises.
Evaluate technical expertise with your control platforms and automation equipment:
- Verify hands-on work with the PLC brands you run (Rockwell ControlLogix/CompactLogix, Siemens S7-1500/TIA Portal, Mitsubishi MELSEC iQ-R, Omron NJ/Sysmac, Beckhoff TwinCAT)
- Confirm familiarity with robots and peripheral equipment in your production environment
- Assess demonstrated ability to integrate diverse systems
Assess industry-specific knowledge and application experience:
- Look for proven track record in your manufacturing sector
- Verify understanding of regulatory requirements and compliance documentation
- Check knowledge of production constraints and quality standards
- Confirm experience with common process challenges in your industry
Review project management and delivery capabilities:
- Examine past projects of similar complexity
- Understand typical timelines from design to commissioning
- Review testing and validation methodology
- Verify ability to hit your production startup schedule
CSIA certification is one signal of partner governance. Formal audits cover project management, the system development lifecycle, quality assurance, IT/cybersecurity, and service/support. Treat it as supporting evidence next to strong, relevant references—not a substitute for them.
Investigate post-installation support infrastructure:
- Confirm availability of emergency support (24/7 if needed)
- Verify remote troubleshooting capabilities
- Understand response time commitments
- Ask about ongoing optimization and system upgrade services
Check references and request site visits:
- Speak with current customers about reliability, responsiveness, and problem-solving ability
- Visit operating installations to see control systems in production environments similar to yours
- Review FAT/SAT plans for clear owners, test cases, readiness criteria, and completion criteria
Rank finalists on documented results in environments like yours, then validate support terms before you award the work.
Frequently Asked Questions
What are custom controls?
Custom controls are industrial control systems—PLCs, HMIs, SCADA, and motion controllers—designed and programmed for a specific manufacturing process instead of standardized off-the-shelf packages.
What's the difference between a custom controls company and a systems integrator?
Custom controls companies focus on control system design and programming. Systems integrators deliver broader automation that may include robotics, mechanical design, vision, and material handling alongside controls. Some firms, like GLOBAL Automation Technologies, offer both under one roof.
When should a manufacturer hire a custom controls company instead of using off-the-shelf controls?
Custom controls make sense when production processes are too complex for standard solutions, when integrating diverse equipment from multiple vendors, when regulatory compliance requires specific control logic and documentation, or when flexibility to modify control programs is essential for continuous improvement.
How much does a custom control system typically cost?
Costs vary widely with system complexity. Drivers include I/O count, hardware, programming depth, integration scope, validation, panel fabrication, FAT/SAT, commissioning, and change orders. Clear change-order processes and disciplined project management help control scope, schedule, and cost.
What control platforms do custom controls companies typically work with?
Common platforms include Rockwell Automation/Allen-Bradley (ControlLogix, CompactLogix), Siemens (S7-1500, TIA Portal), Mitsubishi MELSEC iQ-R, Omron NJ/Sysmac, and Beckhoff TwinCAT. Most firms specialize in one or two platforms where they have deep expertise.
How long does a typical custom controls project take from design to commissioning?
Timelines depend on scope, long-lead hardware, shutdown windows, and validation needs. Ask bidders for dates across assessment, design, programming, panel build, installation, and commissioning, plus dependencies, owner inputs, and FAT/SAT windows—not generic estimates.
