I'm tring to communicate with my S7-1200 PLC but it give protocol error.

[Onuralp]

NI OPC server gives these protocol errors when i try to read bytes from PLC.

Date Time Level Source Event
12.1.2015 12:10:13 Warning Siemens TCP/IP Ethernet Unable to read 1 bytes starting at offset 30 for Memory Type M (e.g. M30) on device 'PLC_com.PLC-S7-1215c'. Device returned protocol error [Class=0x81, Code=0x04].
12.1.2015 12:10:13 Warning Siemens TCP/IP Ethernet Unable to read 1 bytes starting at offset 8 for Memory Type Q (e.g. Q8) on device 'PLC_com.PLC-S7-1215c'. Device returned protocol error [Class=0x81, Code=0x04].
12.1.2015 12:10:13 Warning Siemens TCP/IP Ethernet Unable to read 2 bytes starting at offset 0 for Data Block DB1 (e.g. DB1,B0) on device 'PLC_com.PLC-S7-1215c'. Device returned protocol error [Class=0x81, Code=0x04].
 

what is the reason of this problem? Can anyone help me?

[Onuralp · Accepted solution]

I found the solution. You need to check the "permit access with PUT/GET communication from remote partner (PLC, HMI, OPC, ...)". After that i compiled the project and accessed to the PLC.

[TDE49]

Hello,

You must configure the FB14 (GET) and FB15 (PUT) in TIA PORTAL ?

Thanks in advance for your answer.

[Gryffindor]

Hi,

Since this is an older post, it would be useful to have more information about your situation. What errors are you seeing? Are you using the exact same hardware? 

I would actually recommend creating a new post so that it will get more visibility.

Have a good one!

[carlosmicointegrale]

Thank you very much for your reply, It helped solving my issue

[harbi]

You need to check the "permit access with PUT/GET communication from remote partner (PLC, HMI, OPC,)

[gibsonmarth]

Thanks master!!!!