IEEE 754 to Simatic KG float format


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Hello !, I have a Profibus PA net with Pepperl & Fuchs DP/PA coupler and a IM308C DP master in Simatic CPU 944 rack. the profibus net works ok, but I can not read correctly the instrument values in the master memory because they are written in IEEE 754 format, which is not compatible with the KG float format in siemens CPU, anyone know how to convert these formats through the S5 program ?
Thanks !