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| Object value | Description |
|---|---|
| True | The line is working. |
| False | The line is not working. Note: Solving line failure problems depends on the line category. Each line generates the output file called line_name.log placed in the trace subdirectory of the application directory. The file contains detailed information about the error. |
The communication line value may have the Weak status bit set if a configuration change to the line parameters has occurred that is not dynamically supported (currently a change in the line category) and requires a restart of the communication process or a RELOAD command.
The definition of working of the line depends on its category:
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- closing the line (for lines of categories Serial, Serial Line Redundant, System Serial System&Line Redundant, and RFC2217 Client with the LNSTAT OPEN/CLOSE command will change the value of the line to False.
- closing the TCP/IP-TCP line in the Modbus Client protocol due to the Immediate Disconnect protocol parameter will cause the line value to change to False.
- closing the TCP/IP-TCP line in the IEC 60870-5-104 protocol due to disabling all communication stations will cause the line value to change to False.
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- Line category SerialOverUDP Line Redundant: the FA - FB flags inform about a communication failure on the primary/secondary line.
- Line category SerialOverUDP System&Line Redundant and TCP/IP-TCP System Redundant: the FA - FD flags inform about a communication failure on the primary/secondary line of the A/B system.
- Line category RFC2217 Client: flags inform about connection to the specified IP address (FA - 1st address, FB - 2nd address, etc).
- Line category TCP/IP-TCP and communication protocol IEC 870-5-104 Server: flags inform about connected clients. For a detailed description see the note in the description of the protocol.
- Line category TCP/IP-TCP or TCP/IP-TCP Redundant and multiple client communication protocols (e.g. IEC 870-5-104, MODBUS Client, DLMS/COSEM, Siemens SAPHIR, OEM protocols): flags inform about connection to the specified IP address (FA - 1st address, FB - 2nd address, etc).
Note: the Siemens SIMATIC S7 ISO on TCP communication protocol does not have such diagnostics, as it can create up to 4 TCP connections in parallel.
If the start parameter /NFL is specified, the line flags are not set.
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