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you're communicating through the programming port using AS511 protocol. right? The protocol is slightly different for 16-bit and 32-bit S5 CPUs, some address fields in the AS511 header are wider (32-bit). Your HMI software should query the PLC at the beginning of communication (or have a...

Ok, thanks. meanwhile I got the answer from Siemens' Hotline: "sorry, but no Delphi samples are available". It seems that that's all what they want to say on this matter :( Cheers Romela

dear Cliff, have you found a way to interface to the v5.4 S7ProSim? I'm having the same problem with an application written in Delphi 7. I queried Siemens too, but their Hotline didn't provide a solution yet. regards