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Object value of category Communication lines can have also flags (user attributes) set. Currently, they are implemented for the following combinations of line categories and communication protocols:
- 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: 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): 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.
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