IEC 104 Server (Slave)
In Server (Slave) mode inSCADA lets external master stations connect and read data from it. The mode is typically used to:
- present data over IEC 104 to a higher-level SCADA or control centre
- share data between distribution centres
- carry IEC 104 communication between separate inSCADA installations
Configuration
Section titled “Configuration”Connection
Section titled “Connection”| Parameter | Example | Description |
|---|---|---|
| Protocol | IEC 60870-5-104 Server | The protocol |
| Port | 2404 | The listening port (for incoming connections) |
| Buffering Period | 1000 ms | The data buffering interval |
The remaining connection parameters (t1, t2, t3, k, w and the field lengths) have the same shape as on the client and must match the master that connects.
Device, frame and variable
Section titled “Device, frame and variable”These are defined exactly as in client mode. The values of the variables you define are presented to the connected master as IEC 104 ASDUs.
Sending spontaneous events
Section titled “Sending spontaneous events”In server mode inSCADA sends a spontaneous event to the connected master by itself whenever a variable’s value changes. The Buffering Period parameter decides how often those events go out.
A typical deployment
Section titled “A typical deployment”Here inSCADA collects data from field devices over several different protocols and presents it upwards as an IEC 104 server — acting as a protocol gateway.