If you mark the data interface Modbus Client in the signal tree of the I/O Manager, you will see a table in the right part of the window which shows all available connections of this interface.

Buttons

  • The <Reset statistics> button can be used to reset the error counter and the average, min and max cycle times.

  • With the <Open log file> button, you can open the log files with an ASCII Editor to see the history of errors.

The list of connections shows the following values

  • IP address: Address of the Modbus server

  • Error count: incremented with the detection of sporadic transmission errors (connection failure), or in case the Modbus server sends an error code, see Troubleshooting

  • Messages per cycle: The number of telegrams which are necessary to receive data of this module

  • Update time: The cycle in which ibaPDA requests the data from the Modbus server (maximum calculated from the configured update time and the Modbus server response time)

  • Response time Actual: The time the Modbus server sends with (time between request and response)

  • Response time Average, Min, Max: calculates values since the start of the acquisition or the reset of the counter with the <Reset statistics> button

Colors

  • Green: The connection is OK.

  • Red: The connection has failed.
A failed connection may have the following causes

  • Modbus Server is in stop

  • No Ethernet connection between ibaPDA PC and the Modbus PLC

  • Error in the connection configuration:

    • incorrect remote IP address

    • The ibaPDA port number and the connection configuration do not match.
Other errors

  • If values in the "Error count" column are high, this points to one of the following errors:

    • Error in message header