After writing, the V104 station waits for an from the RTU. If the station does not receive this, the "write" is considered failed. Best Practices for Command Station Management
If you are using a Python-based command station, the process typically follows these four steps: Step 1: Initialize the Connection
Sending a numerical value, like a frequency or voltage level (Type ID 48-50). How to Execute a "Write" (Step-by-Step) write at command station v104
Always log the User ID and Timestamp for every write command. In industrial settings, knowing who turned off a generator at 2:00 AM is critical. Summary Table: Common Write Commands Switching C_SC_NA_1 (45) Turning a light or motor on/off. Valve Control C_DC_NA_1 (46) Opening/Closing a water or gas valve. Setpoint C_SE_NC_1 (50) Setting a target temperature (float). Station — iec104-python 2.2 documentation
Every "write" operation targets an . Think of this as the specific "mailbox" for a device component—for example, IOA 101 might be a power switch, while IOA 202 is a temperature threshold. 2. Command Types (ASDU) After writing, the V104 station waits for an from the RTU
Open/Close/Stop operations (Type ID 46).
In the IEC 104 protocol, writing is referred to as . Unlike simply reading data (monitoring), writing involves a "Select-Before-Operate" (SBO) or "Direct-Execute" sequence to ensure that the command reaches the correct destination without errors. 1. The Write Target: Information Objects How to Execute a "Write" (Step-by-Step) Always log
V104 allows for multiple connections. If your primary station goes down, ensure your write scripts can failover to a secondary IP.
import c104 # Connect to the remote station at its IP address connection = c104.Connection(ip="192.168.1.50", port=2404) connection.start() Use code with caution. Step 2: Define the Station and Point
"Writing" at this station means sending commands—such as switching a relay or adjusting a setpoint—from a controlling station to a remote terminal unit (RTU).