Configure the signals to be measured in the Analog and Digital tabs. You set the length of the signal tables, i.e. the number of signals per table, in the General tab under Module Layout.

Analog and Digital tab

Specific columns for Modbus client TCP modules:

Server

The server number is usually only relevant when you are working with a gateway that has multiple remote servers connected. The server is entered in the Modbus message in the Unit ID field. In Modbus TCP mode, the server number is ignored by most Modbus servers.

Register

The register number reaches from 0 to 65535 or from 1 to 65536, depending on the option Addresses start at 1 on the General tab. Each register is 16 bit wide. You can specify the register number in hexadecimal format or in decimal format. You switch between them via the context menu.

For digital signals, this column only appears for the digital type of access "Holding registers", in which the bits (0-15) from a holding register, e.g. one status word, are acquired.

Data type (analog signals only)

Select one of the following data types: BYTE, WORD, DWORD, INT, DINT, LINT, SINT, ULINT, FLOAT, DOUBLE.

Please note the following:

  • The values of data type FLOAT, DINT and DWORD Float use 2 registers each.

  • The data type DOUBLE uses 4 registers.

  • 2 values of the BYTE data type use one register.

  • Values of the data type ULINT are converted by ibaPDA into the data type DOUBLE.

    With large ULINT values, there may be a loss of resolution as these cannot be displayed exactly in the DOUBLE data type and are rounded.

Bit no. (digital signals only)

The bit number corresponds to the coil number, the discrete input number or the bit number within the holding register. The value range is from 0 to 65535 or 1 to 65535, depending on the parameter Addresses start at 1.