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S7-1200

Posted: Sun May 17, 2020 6:38 am
by marco
Hi everyone,
I am trying to read value from s7-1200 siemens by using s7 protocol.
The connection test works fine but I am not able to read and write value. It shows an error message 27.
Thanks in advance for your help

Re: S7-1200

Posted: Sun May 17, 2020 3:16 pm
by Suppanel
Hello,
Thanks for your inquiry.
Please verify that you have "Optimized Block Access" disabled in your DB preferences in your PLC project.

Regards.

Re: S7-1200

Posted: Fri May 22, 2020 7:44 am
by Lois20000
Hello im new here, im using 315DP and get the same error.
I try to read a periferie Input word.

Thanks.

Re: S7-1200

Posted: Fri May 22, 2020 12:05 pm
by Suppanel
If you mean a fieldbus remote input then Suppanel can't access it. Try copying the input to an internal bit of the PLC.

Siemens has never published the communication protocol for its PLCs. Suppanel and others HMI use an old communication library that has many limitations.

Thanks for you inquiry.