V5 and V6 predate modern OPC UA/TLS hardening, carry CISA-tracked CVEs, and are broken for remote OPC DA by Microsoft's non-disableable DCOM hardening. The winning play is rarely rip-and-replace — make N3uron your modern UNS/edge layer and, where it makes sense, bridge a current TOP Server via OPC UA for the exotic drivers. Select your version below to see your risk, then find your drivers in the migration matrix.
For most legacy V5/V6 sites, the winning play is to make N3uron the UNS/edge layer and connect it via OPC UA/DA to a current, supported TOP Server that keeps serving the exotic drivers. You modernize the architecture and adopt a unified namespace without ripping out proven connectivity.
Modbus, Siemens S7 TCP, AB EtherNet/IP, OPC UA/DA, SQL and DNP3 map to native N3uron modules. Export TOP Server tags to CSV, reshape, and bulk-import — the cleanest, highest-volume path.
For Omron FINS, Mitsubishi MELSEC, GE SRTP and mixed fleets, keep a current TOP Server as the driver and let N3uron's OPC DA/UA Client ingest it into the UNS. You get the modern layer today.
For DF1-serial, Siemens S5/S7-200, Modbus Plus/ASCII and EFM-heavy sites, the honest answer is a TOP Server V5/V6 → V7 security upgrade rather than N3uron.
Select the version you are on and the page will update the risk status below. V7 (current TOP Server) shows as not at risk.
Licensing is module-based with unlimited tags, devices and clients per license, sold as an annual subscription that includes a year of Support & Maintenance. N3uron runs on Windows, Linux, Docker and ARM in under 1 GB of RAM, and tag configs import/export via CSV.
Find your TOP Server drivers to see whether they migrate directly to a native N3uron module, belong in a hybrid architecture bridged via OPC UA, or are best kept on TOP Server. Filter by tier:
| TOP Server driver family | N3uron native equivalent | Migration tier | Key gaps / notes |
|---|---|---|---|
| Modbus TCP / RTU | Modbus Client | Direct | No ASCII, Enron Modbus, or Modbus Plus; FC16 is not a true block write. |
| Siemens S7 TCP (S7-300/400/1200/1500) | Siemens S7 Client | Direct | 1200/1500 need optimized-access OFF + PUT/GET; no S5, S7-200, LOGO, or MPI/Profibus. |
| Allen-Bradley ControlLogix / CompactLogix (Ethernet) | EtherNet/IP Client | Direct | Module new in v1.22.0 (2025); EtherNet/IP only. Validate against real fleets. |
| AB MicroLogix / SLC 500 / PLC-5 | EtherNet/IP + PCCC | Hybrid | No DF1 serial in N3uron; DF1/CSP devices stay on TOP Server. |
| OPC UA client / server | OPC UA Client + Server | Direct | Full parity; the core of the modern stack. |
| OPC DA client | OPC DA Client | Direct | Local + remote DCOM; connects to SWToolbox.TOPServer.V6 ProgIDs — the hybrid linchpin. |
| ODBC / SQL | SQL Client | Direct | MS SQL, Oracle, MySQL, MariaDB, PostgreSQL. |
| DNP3 | DNP3 Client + Server | Direct | Ethernet / serial; strong in utilities and oil & gas. |
| IEC 60870-5-104 / -102 | IEC-104 / 102 Client + 104 Server | Direct | Strong in power / utilities. |
| BACnet/IP | BACnet Client | Direct | Building automation. |
| SNMP | SNMP Client | Direct | IT / infrastructure / data center. |
| IEC 61850 MMS | Not native | Hybrid | Keep on TOP Server; bridge via OPC UA. |
| Omron (FINS), Mitsubishi (MELSEC) | Not native | Hybrid | N3uron reaches Omron NJ/NX only via EtherNet/IP; keep TOP Server via OPC UA. |
| GE / Emerson SRTP & SNP | Not native | Hybrid | TOP Server via OPC UA. |
| Yokogawa, Toyopuc, Fanuc Focas CNC | Not native | Hybrid | TOP Server (or OmniServer / Focas) via OPC UA. |
| Oil & Gas EFM (ABB Totalflow, Fisher ROC/ROC+, BSAP) | Not native | Stay | EFM export + proprietary protocols are a TOP Server strength; keep them there. |
| Custom ASCII / serial / DDE oddities | Custom Client / OmniServer | Hybrid | OmniServer via OPC UA is often the cleaner answer. |
| Legacy AB DF1 serial, Siemens S5 / S7-200, Modbus Plus/ASCII | Not native | Stay | Honest recommendation: version-upgrade TOP Server to V7. |
Verified against docs.n3uron.com (V1.22). N3uron's EtherNet/IP module is new (v1.22.0, 2025) — validate against real ControlLogix/CompactLogix fleets before promising parity at scale. Kepware and N3uron tag addressing differ, so CSV import reduces but does not eliminate re-mapping effort, especially for Siemens DB and AB tag structures.
The table below shows the security and end-of-life status across the TOP Server / KEPServerEX code base.
| Version | Release Window | Risk | Security / Lifecycle Summary |
|---|
Advisory details reference Kepware's public EOL table, the CISA ICS record (ICSA-23-208-02), Microsoft's DCOM hardening guidance (CVE-2021-26414 / KB5004442), and associated CVEs for the KEPServerEX / TOP Server code base.
N3uron replaces a monolithic Windows/DCOM OPC server with a modular, edge-native platform — the substrate for a unified namespace and Industrial AI.
MQTT/Sparkplug B pub/sub, store-and-forward, embedded historian, and Linux/Docker/ARM deployment in under 1 GB of RAM — runs on repurposed IPCs or a Raspberry Pi.
Outbound-only, TLS-encrypted, firewall-friendly connections eliminate the DCOM/tunneling workarounds legacy OPC DA now requires after the March 2023 hardening.
Module-based licensing with unlimited tags, devices and clients per license, sold as an annual subscription — no escalating tag-count costs.
Role-based access, certificates, an Audit Trail for 21 CFR Part 11 / NERC CIP, and a Data Diode module — with none of the unpatched V5/V6 CVE exposure.
Scripting, Derived Tags and Linked Tags build an ISA-95 model, central multi-node management, redundancy, and Web Vision visualization.
N3uron's MCP Server exposes the contextualized model to AI agents, feeding chatUNS.ai, jonjon.ai and orangespark.ai — the move from connectivity to Industrial AI.
Export TOP Server tags to CSV, reshape them, and bulk-import into N3uron. Direct-tier drivers migrate cleanly this way.
Stand up N3uron alongside TOP Server during cutover — no big-bang switchover, no data loss thanks to store-and-forward.
For niche PLCs, keep TOP Server as the driver and have N3uron's OPC DA/UA Client ingest it. Front legacy OPC DA clients with N3uron's OPC UA Server.
Add Historian and publish to a unified namespace via MQTT/Sparkplug, then prove value with an AI/UNS use case such as a chatUNS.ai query.
Migrating a dormant connectivity seat is the entry point into the UNS and AI layers — the core of Software Toolbox's move from a transactional connectivity vendor to a full-stack Industrial AI company. The contextualized model N3uron builds feeds chatUNS.ai, jonjon.ai and orangespark.ai, and N3uron's MCP Server exposes it directly to AI agents.
Learn more about chatUNS.aiEverything you need to scope your drivers, evaluate N3uron, and plan a low-risk migration.
Evaluate N3uron with unlimited tags on Windows, Linux, Docker or ARM at no cost.
Start free trialFor stay-segment drivers, upgrade TOP Server V5/V6 to V7 for the current security baseline.
See the upgrade pathUnderstand why the March 2023 DCOM hardening breaks remote OPC DA on old builds.
Read the KBReview the public CISA record of KEPServerEX / TOP Server vulnerabilities.
Read advisories