Start an OT Security Consultancy for Small Manufacturers

1. 1

   Respect the difference between IT and OT

   On a plant floor, availability beats confidentiality: a vulnerability scan that knocks over a PLC costs real money and your contract. Learn the industrial protocols, the Purdue segmentation model, and the discipline of passive assessment before you ever plug into a production network. If you come from IT, partner with a controls engineer until the floor knowledge is genuinely yours.

2. 2

   Build a production-safe assessment

   Package a fixed-scope engagement: inventory every connected device on the floor (there are always more than the client believes), map what talks to what, review remote access paths that vendors installed years ago, and rank risks by production impact. Passive network monitoring and walk-downs, not aggressive scanning, are how you gather this safely.

3. 3

   Lead with segmentation and remote access

   The two fixes with the best risk-per-dollar in small plants: separating the office network from the control network so ransomware on a laptop cannot reach the line, and replacing the forgotten always-on vendor remote access with controlled, logged connections. These are concrete projects a plant manager can budget, and they follow naturally from your assessment.

4. 4

   Plan for the ransomware day honestly

   Small manufacturers get hit because downtime forces fast payment. Build the recovery plan around production: which systems restore first, where offline configuration backups for PLCs and HMIs live, how the plant runs degraded, and who calls whom at 2am. Test it with a tabletop. No one can promise prevention; provable recovery time is the honest sell.

5. 5

   Use customer and insurance pressure as your channel

   Big OEMs now push security questionnaires down their supply chains, defense-adjacent shops face CMMC (its own established consulting lane), and cyber insurers ask pointed questions about controls networks. Each pressure point creates a motivated buyer. Regional manufacturing associations and machine shops' peer networks are where those buyers ask for referrals.

6. 6

   Grow from projects into monitoring retainers

   After segmentation comes the ongoing question: is anything strange happening on the floor network? Deploy passive OT monitoring and review it monthly for a retainer fee sized to a small plant's budget. A handful of monitoring clients on top of assessment and project work makes the practice durable, and no generalist MSSP in your region can credibly compete for it.

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