The S7 Request Decoder module allows the acquisition of up to 1024 digital signals sent as a maximum of 64 words (16 Bit). This module type is suited for applications where large amounts of digital signals have to be acquired and for which the max. 1024 directly addressable digital values of the ibaBM-DP are not sufficient.

Configure a separate PROFIBUS slave and Request block call for each module.

General tab

For more information on the module settings, see General module settings and General module settings .
Connection configuration

Configure the connection of the S7 Request Decoder module in the same way as the connection for an S7-Request module, see Connection settings .

Digital tab

The declaration of the digital signals is done in two steps.

  • First define the words (source signals), which are broken down for the digital signals (bits).

    You can directly enter the words as basic signals for decoding via the absolute S7 operands. Only word operands (e.g. PIW, MW, DBW) are allowed.

    You can also use S7 symbols by generating address books. For detailed information, see Selection via the symbolic operand addresses. The signals selected in S7 CFC and symbol browser are applied and the columns Name, S7 symbol, S7 Operand and Data Type are filled in automatically.

  • You can open each word (source signal) via the <+> button to display the list of associated digital signals.

    Then define the individual digital signals (bits) of the source signal.

The individual columns of the signal table have the following meanings:

Source signal

Decoder

Enter a name for the source signal.

S7 Operand/S7 Symbol

Enter the S7 operand to which the signal is assigned and, if applicable, the S7 symbol.

DataType

Enter the data type of the signal. The data type also determines the number of digital signals. ibaPDA automatically derives the possible data type from the S7 operand or S7 symbol.

Active

If you activate the source signal, it is acquired with all digital signals. You can deactivate individual digital signals.

Individual digital signals (bits)

Name

Enter a name for the individual digital signals.

Active

If you activate the signal, the signal is acquired and is also considered when checking the number of licensed signals.