MergenHub IEC 60870-5-104 — substation telemetry
The TCP/IP telecontrol standard of European electricity infrastructure. MergenHub connects RTUs and substation control units together with the General Interrogation and command model.
| Tag | Address | Value | Quality |
|---|---|---|---|
| Breaker1_Pos | M_SP_NA 1001 | 1 | |
| Bus_Voltage | M_ME_NC 5001 | 33.14 | |
| Line_Current | M_ME_NC 5002 | 121.6 | |
| Active_Count | M_IT_NA 7001 | 45120 | |
| General_Alarm | M_SP_NA 1010 | 0 |
The MergenHub interface — IEC 104 station single-point, measured and counter values with IOA addresses; CP56Time2a time tag.
What is IEC 104?
IEC 60870-5-104 is the TCP/IP transport of the 101 series; it carries telemetry and telecontrol between substations and control centres as ASDUs. The link is managed with StartDT/StopDT, and General Interrogation captures a snapshot of all points.
Where is it used?
Electricity transmission/distribution substations, RTUs and SCADA control centres. Common in grids where time-stamped reporting and centralized command dispatch are standard.
Feature coverage
Standard ASDU types are supported together with link management and the command model.
General Interrogation
GI for an integrity snapshot of all monitoring points; group interrogation and counter interrogation.
Single / double command
Single/double command (C_SC/C_DC), regulating step and setpoint commands (C_SE) — select+execute or direct.
ASDU types
M_SP/M_DP single-double point status, M_ME measurements (normalized/scaled/short-float), M_IT counters.
Time synchronization
Clock synchronization (C_CS) and CP56Time2a time-stamps for event ordering.
StartDT / test frame
StartDT/StopDT lifecycle, test frames (U-format) and k/w flow windows for a resilient session.
Reconnection
Automatic reconnection on a dropped link and retry logic on write requests.