How to Choose a Control System Integrator: A Checklist for Plant Managers

Hiring a control system integrator is a high-trust decision. You’re handing a third party access to systems that run safety-critical processes — a mistake doesn’t just cost money, it can cost uptime, product quality, or worse. Yet many facilities choose an integrator based on little more than a proposal and a phone call. Here’s what to actually check before you sign.

1. Platform experience that matches your systems

Not all integrators work across all platforms. Ask directly:

• Which PLC, DCS, and SCADA platforms do they have certified experience with (Rockwell/Allen-Bradley, Siemens, Emerson DeltaV, AVEVA/Wonderware, etc.)?
• Have they worked on your specific hardware generation, not just the product line?
• Can they name a project of similar scope and complexity to yours?

An integrator who’s vague about specific platform experience is telling you something.

2. Industry-relevant experience

A team that’s spent years integrating packaging lines isn’t automatically equipped for a chemical batch process with strict safety instrumented systems. Ask for examples of work in your specific industry — oil & gas, chemicals, food & beverage, pharma — and what regulatory or safety standards they’ve worked within (NFPA, ISA-84, FDA 21 CFR Part 11, etc., depending on your sector).

3. Certifications that actually mean something

Look for concrete, verifiable credentials:

• UL 508A panel shop certification — indicates their panel builds meet recognized electrical safety standards.
• CSIA membership — the Control System Integrators Association audits member firms against defined engineering, project management, and business practices. It’s one of the few third-party checks available in this industry.
• Manufacturer partner status — official certified partner status with Rockwell, Siemens, or other platform vendors, not just “we’ve used their software.”

4. A real project management process

Ask how they handle:

• Scope changes mid-project
• Testing and factory acceptance before installation
• Documentation handoff (as-built drawings, logic documentation, HMI screens)
• Response time commitments for post-commissioning support

If the answer is vague, expect the project execution to be vague too.

5. Insurance, bonding, and business stability

For safety-critical work, confirm the integrator carries adequate general liability insurance and, for larger projects, appropriate bonding. Ask how long they’ve been in business and whether they can provide references from clients with projects of comparable size, completed in the last two to three years.

6. Support after commissioning

The project doesn’t end at startup. Ask:

• What does ongoing support look like — response times, availability (24/7 or business hours only)?
• Do they offer a service agreement, or is every future call treated as a new project?
• Will the engineers who built the system be available if something goes wrong six months later?

7. Communication style, from the first call

This one’s less checklist and more instinct: does the integrator ask detailed questions about your process, your constraints, and your existing systems — or do they jump straight to a generic proposal? The quality of the discovery conversation is often a preview of the quality of the engineering that follows.

Red flags to watch for

• Reluctance to name specific past projects or provide references
• No documented certifications, or certifications they can’t verify
• Pressure to sign quickly without a proper site assessment
• Proposals that don’t specify platforms, scope, or testing procedures in writing

Where Reliamation fits in

Reliamation LLC is a Texas-based PLC and DCS system integrator serving oil & gas, chemicals, food & beverage, pharmaceutical, and power clients across the Gulf Coast, with senior controls engineers on every project from design through 24/7 support.

Evaluating integrators for an upcoming project? Request a consultation — we’re happy to answer every question on this list directly.