CODEWITHSUNDEEP
siemens
Marcus S
Marcus S

Reputation: 143

S7.net PLC tag reading exception thrown - Received 12 bytes: '32-02-00-00-00-00-00-00-00-00-81-04', expected 19 bytes

I'm trying to connect to a S7 1212 using this library. I can connect to the PLC fine, but whenever I try and read a tag I get the error exception Received 12 bytes: '32-02-00-00-00-00-00-00-00-00-81-04', expected 19 bytes.

I'm using the latest version of the software, and as far as I can tell, the PLC is set up correctly. My code is as basic as it can be:

using (var plc = new Plc(CpuType.S71200, "10.10.10.180", 0, 1))
        {
            plc.Open();
            try
            {
                bool tagName = (bool)plc.Read("DB1.DBX0.0");
                Console.WriteLine("Tag Name: " + tagName);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }

DB1 and OB1:
image

Network: image

The permissions are full access and PUT/GET communication is allowed: image

And the Datablock Optimised block access is turned off.

Any idea's why I am getting this error?

Upvotes: 4

Views: 2108

Answers (2)

kingofl337
kingofl337

Reputation: 11

I also had this issue, as noted it comes down to the settings being sent to the PLC. You have to write hardware changes to make this work.

Screenshot of how to fix

Upvotes: 1

Marcus S
Marcus S

Reputation: 143

The issue was with the PLC itself, not being compiled and downloaded to the CPU (in case this helps anyone else)

Upvotes: 3

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