F_SwapRealEx

The memory representation of a REAL number on a bus terminal controller (e.g. BC2000, BC3100, BC9000) differs from the memory representation of a REAL number on an x86/x64/Arm^® system (IPC or embedded PC).
To correctly represent a REAL number of a bus terminal controller on an IPC, the Hi and Lo words of the REAL number must be swapped. Under the programming environment this is already done in online or simulation mode. In order to request REAL data from a bus controller over the network (ADS protocol, ADSDLL, AdsOcx, etc.) and represent it correctly on an x86/x64/Arm^® IPC, the REAL data must be converted to the correct format. This can be done on the bus terminal controller side or the IPC side.

The function F_SwapRealEx can be used to convert the REAL variables (e.g. variables to be read by a VB application or recorded with TwinCAT Scope View) into a suitable format on the PC side. The function changes the memory representation of the transferred fVal parameter (VAR_IN_OUT).

Return value

VAR_IN_OUT
    fVal : REAL;
END_VAR