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The exact ports, protocols and services depend on the cobot model, software revision, PLC/HMI integration and any monitoring or remote-support features. Confirm them in the current manufacturer and integrator documentation before applying access-control rules.
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What segmentation changes in a cobot network
A cobot cell is an OT environment: its controller, safety systems, PLCs, HMIs, engineering stations and switches support a physical process. Office laptops and guest phones have different trust levels, patch cycles and failure consequences. Putting every device on one flat LAN lets a compromised workstation or unmanaged guest device reach systems that were never intended to accept those connections.
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Segmentation creates zones and controlled conduits between them. The zone boundary can be a routed firewall, an industrial firewall, a gateway or, for higher-criticality equipment, a physically separate switching and routing path. The boundary should make an explicit decision for each flow: source, destination, protocol, port, direction and business purpose. Everything else is denied or remains unreachable.
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NIST SP 800-82 Rev. 3, published in September 2023, describes network segmentation and isolation as part of an OT security architecture. Joint government guidance on secure OT connectivity, published or reviewed on 15 January 2026, likewise treats segmentation as one layer of defense rather than a substitute for secure OT devices, authentication, patching and monitoring.
A VLAN or subnet is therefore a useful building block, not the complete control. If routing and firewall policy permit unrestricted traffic between the VLANs, the devices are still effectively connected. Segmentation is effective only when the zone boundary enforces the intended conduits.
Inventory the cobot’s communications before filtering anything
Filtering an unknown protocol can stop programming, status reporting or a safety-related function. Build the communications inventory with the controls engineer, integrator and system owner, then keep it under change control. The UK National Cyber Security Centre’s Principle 4 guidance calls for documenting assets, communication needs, protocols, ports, existing controls, constraints and possible compromise paths.
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Assets to include
- The cobot arm and its controller, including every network interface.
- PLCs, safety controllers, cell I/O, drives and other machines that exchange control or status data.
- HMIs, teach pendants, engineering laptops and programming workstations.
- Cell switches, wireless bridges and any service devices installed inside the cell.
- Historians, manufacturing-execution systems, time services, directory or certificate services that the deployment actually uses.
- Vendor or integrator remote-support systems, jump hosts and cloud monitoring components, if they exist in this installation.
- Safety-related systems and maintenance equipment whose availability could affect people or the process.
Record each flow in a usable matrix
| Field | What to document |
|---|---|
| Source and destination | Hostname, device role, IP address or approved address range, and network zone. |
| Direction | Which side initiates the connection; distinguish one-way telemetry from two-way control. |
| Protocol and port | TCP or UDP, the manufacturer-specified port, and any application or industrial protocol name. |
| Purpose | Programming, motion coordination, HMI status, time synchronization, logging, maintenance or another defined function. |
| Owner and evidence | Responsible person, manufacturer manual section, integrator statement or observed configuration. |
| Availability requirement | What happens if the flow is delayed or unavailable, and whether the process has a safe local mode. |
Do not infer that a service is required merely because a product supports it. A deployment may not use cloud telemetry, vendor remote access, a directory service or a historian. Conversely, an integrator may have added a dependency that is absent from a generic robot manual. Record the software version and application architecture next to the flow so that a later upgrade triggers a review.
Design zones and controlled conduits
A practical starting layout has four logical areas. Adapt the boundaries to the site’s criticality, legacy equipment, regulatory obligations and availability requirements.
| Zone | Typical contents | Permitted connections | Default posture |
|---|---|---|---|
| OT/cobot cell | Robot controller, PLCs, HMI, safety and cell switches | Only documented control, monitoring, maintenance and safety-related flows | Deny adjacent-network initiation unless a documented exception is essential and supported |
| Corporate/office | Employee endpoints, servers and business applications | Specific services to approved OT or DMZ destinations, if required | No broad route into the cell |
| Guest wireless | Visitors’ phones, tablets and laptops | Internet access through its own gateway | No route to OT, corporate resources or other guest clients where isolation is available |
| DMZ or controlled-services zone | Historian relay, update proxy, jump host or other intermediary that genuinely needs cross-zone exchange | Explicitly mapped flows to each side | Not a shortcut around the OT boundary |
Logical versus physical separation
Separate VLANs and subnets are often appropriate when the switching and firewall architecture can enforce the required policy and the equipment is managed throughout its lifecycle. Use a routed boundary with deny-by-default rules rather than placing the VLANs in the same unrestricted broadcast domain.
For high-criticality devices, consider physically separate switches, interfaces or routing paths. NIST’s OT guidance notes physical separation as an option when the consequences of a compromise or an availability failure justify the additional cost and operational complexity. Physical separation does not remove the need for access control at any remaining connection; it reduces the number of paths that must be controlled.
Keep guest Wi‑Fi outside the OT design
Workplace wireless guidance from GOV.UK recommends separate addressing, routing and access controls for different classes of wireless users, along with isolation between Wi‑Fi clients. Assign guests to a dedicated SSID and network, prevent routes from that network to the OT zone, and enable wireless client isolation when the access-point platform supports it. If a wireless device must provide a service to other clients, the same guidance says to move it to a different VLAN rather than weakening guest isolation.
Turn the inventory into boundary rules
At the OT boundary, write rules from the flow matrix instead of starting with a permissive rule and trying to discover what can be removed later. A rule should identify the exact source, destination, protocol, port and direction. Where a product supports it, restrict by approved address objects, authenticated management paths and defined time windows for maintenance.
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- Permit only the documented source-to-destination flows needed for the cell’s operation.
- Deny unsolicited inbound connections from office, guest and other adjacent networks to the robot and controller.
- Restrict outbound connections from the robot to the smallest relevant set of ports, protocols and addresses.
- Separate programming and maintenance access from ordinary office traffic; use a controlled workstation or jump host if the design requires one.
- Disable unused interfaces and services on the controller and network equipment when the manufacturer supports doing so.
- Log permitted and denied connections at the boundary, with enough context to investigate without flooding the OT device or link.
For its documented robot and software context, Universal Robots states: “There must be no inbound connections from adjacent networks to the robot.” Its requirements also state: “Outgoing connections from the robot are to be restricted to allow the smallest relevant set of specific ports, protocols and addresses.” Treat those statements as manufacturer guidance for the applicable model and version, not as a substitute for checking another vendor’s manual. The source is the Universal Robots cybersecurity requirements page.
Implementation procedure
- Appoint owners and define the change window. Include the controls engineer, network administrator, safety representative, system owner and integrator where applicable. Decide how the cell will be stopped safely and how connectivity will be restored if a rule is wrong.
- Capture the current state. Export or record switch VLAN assignments, routes, firewall rules, controller network settings, DNS and time dependencies, remote-access paths and monitoring destinations. Preserve a rollback copy before changing anything.
- Complete the flow matrix. Verify every entry against the exact robot model, controller firmware or software revision, PLC/HMI configuration and deployed maintenance workflow. Mark uncertain entries for confirmation rather than allowing broad access.
- Define the zones. Create the OT/cobot, corporate, guest and any DMZ or controlled-services boundaries in the network design. Choose logical or physical separation based on criticality and the number of paths that must be controlled.
- Assign dedicated addressing and routing. Put the cell devices on their OT subnet or physically separate segment. Give guest wireless its own address space and gateway. Ensure there is no implicit route from guest to OT.
- Place the enforcement point between zones. Use a firewall, gateway or equivalent control that can match the documented source, destination, protocol and port. Put inter-zone routing through that point; do not leave a parallel unrestricted path through another switch, wireless bridge or management interface.
- Apply least-privilege rules. Create narrowly scoped allow rules for required flows, then deny other inbound traffic to the cell and limit robot-initiated outbound traffic. Disable unused services where supported. Order rules so a broad permit cannot override a specific deny.
- Configure wireless isolation. Bind the guest SSID to its guest network, enable client isolation, and verify that corporate or OT SSIDs are not bridged into it. Any wireless service device that must serve clients belongs on a separately controlled VLAN.
- Stage and test with the integrator. Test controller-to-PLC communication, HMI functions, programming, safety-related behavior, logging, time synchronization and any approved remote-support workflow. Change one rule set at a time so a failure has an identifiable cause.
- Monitor and document the final state. Save the approved flow matrix, diagrams, rule exports, test results, owners and recovery steps. Set a review trigger for robot software upgrades, PLC changes, new monitoring services, network redesigns and incidents.
Validate operation without weakening the boundary
Functional checks
- From an authorized engineering station, confirm only the documented programming and diagnostic functions work.
- Verify the HMI receives the expected status and that control traffic reaches the correct cell devices.
- Confirm safety functions remain available and that a network interruption produces the documented safe response.
- Check approved monitoring or historian flows, including their behavior when the intermediary or destination is unavailable.
- Attempt connections from a normal office endpoint and a guest client; each should fail unless a specific, approved flow exists.
Security and recovery checks
- Review firewall and switch logs for unexpected sources, destinations, protocols or repeated denied attempts.
- Verify that the guest network cannot route to OT addresses and that guest clients cannot reach one another when client isolation is enabled.
- Test the documented rollback or isolation procedure during a planned window, not for the first time during an incident.
- Confirm that administrators can reach the boundary device through a protected management path and that configuration backups are usable.
- Record the observed results, rule versions and approvers so a later troubleshooting session has a known-good baseline.
OT changes must account for availability and process safety. The joint secure-connectivity principles emphasize assessing operational impact, using layered controls and planning how connectivity will be isolated and restored. A technically correct deny rule is still a failed change if it stops a required control function without a safe operating procedure.
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An industrial firewall is a plausible product category, but no single appliance or topology is established as suitable for every cobot installation. Compare the design against the actual flow matrix and operating constraints.
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| Option | Strength | Questions to answer | Typical limitation |
|---|---|---|---|
| VLANs with routed ACLs | Uses existing switching and routing infrastructure for straightforward separation. | Can the ACLs match the required addresses, protocols and ports? Is every alternate path controlled? | May provide less visibility or protocol-aware control than a dedicated boundary device. |
| Industrial firewall at the cell boundary | Centralizes policy, logging and potentially OT-protocol support. | Does it support the cobot’s real protocols without adding harmful latency? How is it patched and supported? | Introduces another device whose failure mode and maintenance process must be engineered. |
| Physical network separation | Reduces accidental paths and can suit high-criticality equipment. | Which approved links still cross the physical boundary, and how will they be monitored? | Costs more and can complicate maintenance, monitoring and future expansion. |
| DMZ or intermediary service | Limits direct connections between OT and business or cloud services. | Can the relay, jump host or proxy provide the needed function without becoming a broad bridge? | Creates an additional component to harden, patch and operate. |
For each option, evaluate enforcement precision, OT-protocol handling, failure behavior, safety impact, logging, rule review, patch support, lifecycle ownership and compatibility with the exact robot, PLC, HMI and remote-access workflow. If a design cannot express the required source, destination and direction precisely, it is not ready for production.
Common failures and recovery paths
| Symptom | Likely cause | What to check |
|---|---|---|
| Controller or HMI becomes unreachable after segmentation | A required flow was missing, pointed at the wrong address object or blocked by rule order. | Compare logs with the flow matrix, verify both directions and restore the approved rollback configuration if safe operation is at risk. |
| Programming works only from an old office workstation | The workstation had an undocumented route or service dependency. | Identify the exact initiating connection, move the function to an approved engineering path and avoid reopening the entire office subnet. |
| Guest device can discover or reach OT addresses | Guest and OT networks share a bridge, route or permissive firewall rule. | Inspect SSID-to-VLAN mapping, switch trunks, routing tables and boundary policy; remove the unintended path before reconnecting guests. |
| Historian or monitoring data stops | The destination, relay, time service or outbound port was omitted. | Confirm whether the flow is genuinely required, then add only the documented path and monitor its availability. |
| Boundary outage stops the cell | The device or link failed closed or had no tested bypass or recovery plan. | Follow the approved safe-state and restoration procedure; do not create a permanent any-to-any bypass as an emergency fix. |
Maintain the segmentation as the cell changes
Segmentation decays when equipment is replaced, a temporary laptop becomes permanent, a new cloud feature is enabled or a vendor asks for broad remote access. Review the inventory and rules at each of those events and on a scheduled basis. Remove obsolete addresses and services, verify that logs are still collected, and confirm that administrators know how to isolate the cell and restore approved connectivity.
Remote support deserves particular scrutiny. Permit an explicitly approved, authenticated path to a controlled intermediary rather than allowing adjacent networks to initiate sessions directly to the robot. Restrict the path to the agreed maintenance window and destinations, log its use, and remove temporary access when the work ends.
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