evgeny85

Hello. How can i read information about connection status Modbus TCP? I need see information if connection is lost.

Error bit in TCP block.

(Send a REQ, unable receive data from modbus device for a preset time, then error bit go High)

There could be another methods too such as configure one port for modbus device???

evgeny85

I connect to modbus device by SCADA, not PLC

How did you connect modbus device to SCADA? ???

One my previous project, modbus device connected to PLC .If PLC modbus block gives error  which is steady for a delay of 5Sec, a memory bit programmed  go high and that memory bit used in SCADA to display modbus communication error via Visibility animation properties.

Thanks for reply.

Are you using web access configure modbus alarms as per below  link.

modbus manual

If Yes, as per page 19, you need to add an alarm tag for comm status.

But this post need an advice from modbus  Expert.

Did you manage to find a solution? I am looking to check the Modbus connection and generate an alarm if it is lost. Using Wincc Pro V17.

EDIT:

Found a solution in the Information system of TIA portal "Checking connections with performance tags"

To get the status of a connection named ECL_SM2 you must create an internal tag:

@ECL_SM2@ConnectionStateEx
1 - connection OK

0 - no connection