Network migration
DH+ (Data Highway Plus) to EtherNet/IP migration
DH+ is a legacy peer-to-peer token-passing network used with PLC-5 and SLC 5/04 systems. Star Automations migrates DH+ links to EtherNet/IP, with gateways for staged cutover, and helps troubleshoot DH+ communication faults in the meantime.
Typical migration paths
The right target depends on your I/O count, networks, performance needs and budget. We confirm the target during the audit — the table shows the usual direction, not a fixed rule.
| Legacy | Typical target | What to watch |
|---|---|---|
| DH+ network | EtherNet/IP | Gateways bridge during staged cutover |
| PLC-5 / SLC 5/04 messaging | Rebuilt messaging on the new network | Every MSG needs review |
What needs care in this migration
What is DH+
A legacy Allen-Bradley peer-to-peer network. Stations share a cable and a token, and are identified by station address.
Faults today
Typical causes of DH+ communication faults are duplicate station addresses, wrong termination for the baud rate, damaged cable and failing interface modules. Send us the symptoms.
Migration
We list every device and message, bridge them with a gateway, then move them one at a time.
Our migration process
- Migration readiness audit: inventory of hardware, firmware, networks, programs and spares
- Back up and document the running system before anything is touched
- Design the target architecture and I/O mapping; agree scope and the cutover approach
- Convert and rebuild the program and HMI, with every conversion warning reviewed by hand
- Test in stages: simulation, panel factory test where panels are built, then site testing
- Cutover with a rollback plan, then handover documentation
What we need from you: Program backups (or access to the running processor); Electrical drawings and the I/O list, if available; Network layout and device list; Photos of nameplates, panels and wiring; Your shutdown windows and any safety requirements.
What people look up
- dh+ to ethernet/ip migration
- dh+ replacement
- dh+ to ethernet/ip how to migrate
- dh+ network communication fault
Common questions
What is the DH+ network?
What causes DH+ communication faults?
Planning this migration?
Send what you have — model numbers, a photo of the panel, or just the problem. We reply the same day with next steps. Chennai, Puducherry, Bengaluru, Hyderabad, Delhi and pan-India.
Star Automations is an independent company. Allen-Bradley, Rockwell Automation, ControlLogix, CompactLogix, GuardLogix, PanelView, PowerFlex, Kinetix, FactoryTalk and Studio 5000 are trademarks of Rockwell Automation, Inc. They are used here only to identify the products we work on and do not imply endorsement by, or partnership with, Rockwell Automation.