The Documentation Gap

Most industrial facilities have a documentation problem they don't talk about. The original integrator delivered a working system, but the documentation was thin — or has gone stale. Years of modifications, personnel turnover, and deferred maintenance have widened the gap.

Here are five signs your plant is carrying undocumented automation risk.

1. Only One Person Understands the Logic

If a single controls engineer holds all the institutional knowledge about your PLC programs, you have a bus factor of one. When that person leaves — or is simply on vacation during a critical alarm — the entire facility is exposed.

This is the most common and most dangerous sign.

2. Troubleshooting Takes Hours Instead of Minutes

When an alarm fires and your operators can't trace it back to a root cause without calling in a specialist, your documentation is insufficient. Well-documented systems include alarm rationale, signal flow diagrams, and troubleshooting guides.

3. You Can't Estimate the Cost of a Migration

Planning a controller migration but can't scope the work? That's because you don't have a functional specification for what the current system does. Without it, every migration estimate is a guess — and guesses get expensive.

4. Your Insurance Auditor Is Asking Questions

Industrial insurers are increasingly asking about controls documentation, especially for safety-critical systems. If you can't produce documentation for your safety interlocks, your premiums may reflect that risk.

5. You've Had a "Near Miss" Due to Undocumented Logic

If someone modified a PLC program without understanding the downstream effects — and it caused an unexpected shutdown, safety event, or product quality issue — that's a clear signal that documentation is overdue.

What To Do About It

The good news is that PLC forensics can recover the knowledge locked inside your controllers. The process is methodical and the tools are getting better. Start with your most critical systems and work outward.

Upload a PLC program for free analysis to see where you stand.