Technical capability
Documentation & Design Support
Network drawings, IP schedules, firewall schedules, interface registers, cybersecurity procedures, and FAT/SAT documentation that support assurance and maintainability.
When missing records become an engineering risk
The problem
Many OT projects suffer from weak or incomplete documentation, making future maintenance, assurance review, and cybersecurity management difficult.
Who it is for
- site teams responsible for incomplete or inconsistent OT engineering records
- projects that need controlled cybersecurity and network design deliverables
- operators preparing for maintenance, modification, assurance, or handover
A neat drawing is not necessarily an accurate drawing. Unverified connections and conflicting records should remain visible until evidence supports their closure.
Sources used to rebuild the record
Inputs
- available drawings, schedules, specifications, backups, and change records
- access to knowledgeable engineering, maintenance, supplier, and document-control contacts
- an agreed document basis, naming convention, format, and approval workflow
Document set and confidence boundary
- reconstruction of the known network record for a defined production area
- architecture drawings, IP and interface schedules, and a firewall rule schedule
- documents issued through the client's review and document-control process
How conflicting information is resolved
Sequence
- define the required records, their intended use, sources, and confidence level
- reconcile existing documents against stakeholder knowledge and agreed site evidence
- produce or update controlled drawings, schedules, registers, specifications, and procedures
- record assumptions and unresolved gaps for review before issue
Records produced
- reconcile drawings, schedules, backups and stakeholder knowledge
- mark information as verified, inferred or unresolved
- produce network, addressing, interface and firewall records to an agreed basis
- write requirements and procedures that identify roles, triggers and retained evidence
- take documents through the client's review and document-control process
Controlled engineering documents
Deliverables
- network architecture drawings
- asset register
- IP address plan
- firewall rule schedule
- interface register
- cybersecurity procedure set
- FAT/SAT documentation
Worked example: Recovering an OT network drawing after years of change
- Starting evidence
- Compare the latest issued drawing with switch exports, firewall objects, IP schedules, configuration backups and the knowledge of site maintainers.
- Reconciliation
- Resolve naming differences and duplicate addresses, and mark links that are inferred but not physically or logically confirmed.
- Issue for review
- Produce a controlled draft with its evidence date, boundary, assumptions and open verification points rather than presenting uncertain data as surveyed fact.
- Use
- Use the agreed record as the basis for maintenance, risk assessment or segmentation design, with subsequent changes returned through document control.
Known, inferred and unknown information
Not included unless separately agreed
- claiming undocumented information has been verified where evidence is unavailable
- live configuration changes or intrusive discovery unless separately planned
- whole-site asset inventory where the agreed boundary covers only a defined system
Standards and guidance referenced
Related support and guidance
Related services
Choose this when your project needs specialist engineering capacity. A defined OT cybersecurity work package for risk, architecture, design review, supplier interfaces and assurance evidence within an active industrial project.
Discuss documentation & design support
Use the 30-minute introductory call to outline the system, decision, project stage and evidence currently available. Keep sensitive site details out of the booking form.