DNP3 Master Configuration in SEL RTAC
Key Takeaway
How to configure the RTAC as a DNP3 master to poll third-party RTUs, meters, and relays — outstation setup, data mapping, unsolicited responses, and integrity polling.
Quick Answer
The RTAC acts as a DNP3 master to poll third-party devices not supporting SEL protocol — SCADAPack, Bristol FB300, ABB Totalflow, and other DNP3 outstations via serial or TCP/IP.
Configuration
- Add DNP3 master driver
- Configure port: serial (RS-485, baud rate) or TCP (IP, port 20000)
- Add outstation: master address, outstation address, timeout, retries
- Configure polling: integrity interval, Class 1/2/3 event poll rates
- Enable unsolicited response acceptance
Data Mapping
- Binary Inputs (Object 1/2) → BOOL tags
- Analog Inputs (Object 30/32) → REAL tags
- Counters (Object 20/22) → UDINT tags
- Binary/Analog Outputs → command tags
Simultaneous Operation
The RTAC can run SEL protocol clients, DNP3 masters, Modbus clients, and IEC 61850 clients all simultaneously — each feeding tags into the same unified database. See DNP3 protocol guide and Modbus overview.
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Frequently Asked Questions
Yes. Multiple protocol clients run concurrently — SEL protocol for SEL relays, DNP3 for third-party devices, Modbus for meters — all feeding the unified tag database.
Tags get BAD quality after timeout. RTAC continues retrying. On reconnection, performs integrity poll to sync all values and retrieve buffered events.
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