[?]: info/experience regarding AS620T with FM458

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In my new project I will use Siemens SPPA-T2000 with AS620T and AddFEM I/o
(Simatic S7-400H). Engineering tool will be Tech4function.

Since I normally use to work with Siemens PCS7, STEP7 applications it will be nice, if some one can tell me about the system and what eventually problem that will show up.
OR even better : some engineering tips !




Regards

Oka