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Siemens TCP/IP Ethernet Driver Help

Unable to read <block size> bytes starting at address <address> on device

<device name>. Frame contains errors.

Error Type:

Warning

Result:

1. If device error (such as transport, protocol, or access) occurred:

l If tag is a block tag, the entire block (address -> address + block size) will be deactivated.

All tags within that block will be deactivated. This is signified by the postfix message "...Block

Deactivated."

l If tag is an array tag or string tag, just this tag will be deactivated.

This is signified by the postfix message "...Tag Deactivated."

2. If no device errors occurred:

l If tag is a block tag, the entire block will be invalidated. All tags within that block will be invalidated.

l If tag is an array tag or string tag, just this tag will be invalidated.

Possible Cause:

1. The TPDU response size is incorrect.

2. An unexpected frame was received. The response code may also be incorrect.

3. The frame sequence is out of order.

4. The device's CPU work load is too high.

5. If the tag address references a TOD data type, the DWORD value may be larger than the number of

milliseconds in a day. For example, 86400000.

Solution:

1. Cable noise may cause distortion in the frame, resulting in erroneous data. It may also cause dropped

frames. Verify the cabling between the PC and the PLC's device.

2. Reduce network traffic. If this error occurs frequently, increase the Request Timeout and/or Fail After

attempt count.

3. Decrease the tag group scan rate to reduce the work load on the PLC's CPU.

4. Increase the "Scan Cycle Load from Communication" and "Scan Cycle Monitoring Time".

5. Change the value in the device to a valid DWORD that can be converted to a time that is less than or equal

to 23:59:59.999.

See Also:

Error Codes

Unable to read <block size> bytes starting at address <address> on device

<device name>. NetLink returned error [Code=<code>].

Error Type:

Warning

Result:

1. If device error (such as transport, protocol, or access) occurred:

l If tag is a block tag, the entire block (address -> address + block size) will be deactivated.

All tags within that block will be deactivated. This is signified by the postfix message "...Block

Deactivated."

l If tag is an array tag or string tag, just this tag will be deactivated.

This is signified by the postfix message "...Tag Deactivated."

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