Specifications

Allen-Bradley ControlLogix Ethernet Driver Help

Solution:

Refer to A-B documentation for STS error code definitions. For example, if STS code '0x02'(hex) is returned,

verify the cabling between the remote node (PLC) and the local node.

Unable to read <block size> element(s) starting at <address> on device

<device name>. [DF1 STS=<value>, EXT STS=<value>]. Tag(s) deactivated.

Error Type:

Warning

Possible Cause:

The address requested in the block does not exist in the PLC.

Solution:

Check the status and extended status codes that are being returned by the PLC. An extended status code may not

always be returned; therefore, the error information is contained within the status code. The codes are displayed

in hexadecimal.

Status code errors in the low nibble of the status code indicate errors found by the local node. The driver will

continue to retry reading these blocks of data periodically. Errors found by the local node occur when the KF

module cannot see the destination PLC on the network.

Status code errors in the high nibble of the status code indicate errors found by the PLC. These errors are

generated when either the block of data the driver is asking for is not available in the PLC or the address does not

exist in the PLC. The driver will not ask for these blocks again after receiving this kind of error.

Note:

The block starting at address <address> may be deactivated in the process depending on the severity of the

error.