Your control systems are aging, inefficient, or barely holding together—and downtime costs money. Before you hand over a project to the first automation integrator you find, you need answers that separate the competent from the cut-rate, and the right fit from a costly mismatch.
Do They Understand Your Current Architecture?
Ask the contractor to explain what's already running your floor. If they can't identify whether you're on legacy Allen-Bradley, Siemens S7, or a hybrid mix without you spelling it out, move on. Proper upgrades aren't rip-and-replace jobs—they integrate with what works and modernize what doesn't. A solid vendor will ask about your PLC firmware versions, HMI interfaces, communication protocols (Modbus, Profibus, EtherCAT), and network topology before quoting anything.
Request they perform an on-site assessment. This takes 4–8 hours and costs $500–$1,500 depending on system complexity, but it's non-negotiable. They need to see wiring diagrams, tag databases, current bottlenecks, and safety interlocks before designing a solution.
What's Their Certification and Track Record?
Verify they're certified for the specific platforms you use. Siemens partners, Rockwell Automation integrators, and Beckhoff specialists aren't interchangeable. Ask for three client references in your industry (food processing, automotive, pharmaceutical, manufacturing) and call them. Don't settle for a generic portfolio—ask about similar projects: Did they upgrade a comparable system in 12 months or 24? Did they stay within budget? Did production restart on schedule?
Check if they carry E&O insurance and have a documented quality management system. ISO 9001 certification or equivalent shows they follow repeatable processes, not ad-hoc troubleshooting.
What Are the Hidden Costs and Timelines?
Control system upgrades almost never cost what the initial quote says. Clarify what's included and what isn't:
- Hardware costs (PLCs, drives, I/O modules, networking equipment)
- Engineering and programming (logic rewrite, migration, testing)
- Installation labor (wiring, panel integration, commissioning)
- Training (operator and maintenance staff)
- Downtime fees (if they cause extended production loss)
- Change orders (plan for 10–20% contingency)
A mid-sized upgrade ($150K–$500K) typically runs 6–12 months from design through full commissioning. Confirm whether they include 30–90 days of post-startup support, or if that's extra. Ask about their punch-list process—how do they verify everything works before they leave?
Do They Have a Cybersecurity Plan?
This isn't optional anymore. New control systems sit on networks, and vulnerabilities kill production. Ask:
- How do they segment your control network from corporate IT?
- Do they use VPN or firewall rules for remote diagnostics?
- Will they document all access credentials and change default passwords?
- Are firmware updates patched regularly, and what's their process?
Expect them to provide a risk assessment and compliance roadmap (NIST, IEC 62443, or your industry standard). If they brush this off, they're not mature enough for a critical system.
What Happens If Something Goes Wrong?
Get a clear warranty and support structure in writing. Standard terms are 1–2 years on hardware defects and 90 days on labor. After that, who troubleshoots? Do they offer a service contract (typically 5–10% of project cost annually) with guaranteed response times (4-hour, 8-hour, next-day)?
Ask about their disaster recovery plan. If the integrator goes out of business or the key engineer leaves, how do you maintain your system? You need access to source code, documentation, and a handoff plan.
Comparing Vendors Fairly
Platforms like Mercoly let you request quotes from multiple certified Industrial Electrical & Automation providers, review their credentials, and compare proposals side-by-side—saving weeks of phone calls and bad fits.
Frequently Asked Questions
Q: How much should I budget for upgrading a 15-year-old PLC system? For a mid-sized facility (100–200 I/O points), expect $200K–$600K all-in, depending on whether you're modernizing just the controller or the entire network and HMI.
Q: Should I stick with the same vendor who installed my original system? Only if they're still in business, certified current, and responsive. Legacy integrators often lack modern skills in cloud connectivity or cybersecurity; get competitive bids regardless.
Q: What's the difference between an integrator and a controls engineer? Integrators design and install complete systems; engineers focus on logic and programming. You typically need both roles, though larger firms bundle them.
Start your vendor search today and get detailed proposals tailored to your facility.