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

‎01-12-2015 03:59 AM

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

‎01-12-2015 05:19 AM

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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?