# ID 40018

Channel specific HLI section of MC and PLC differ concerning the amount of bytes.
Description | When the HLI interface is activated by an instance of the FB MCV_HliInterface, it is checked whether the channel-specific areas of the HLI on the PLC side and on the Motion Controller side have the same size. The error message is notified if area size differ about amount of bytes.
Response | Class | - | FB MCV_HliInterface sets its “Error” output to TRUE, waits for a fixed number of cycles, and tries to communicate again with the motion controller via the HLI .
Solution | Class | - | At the outputs “ExpectedHli” and “ActualHli” at the FB instance of type MCV_HliInterface, the version identifiers of the HLI interface can be checked on the PLC and Motion Controller side. Please look for the version identifiers and consider that output “ExpectedHli” is the version identifier of the PLC’s HLI interface and output “ActualHli” is that of the motion controllers HLI interface.

Now check if the motion controller is that with the wrong version identifier or if the PLC application included a HLI library with the wrong version. In first case please start the correct motion controller, in the second case please include the correct HLI-library in the PLC application.

If none of the above causes is present, contact the control supplier and specify the version identifier at the outputs "ExpectedHli" and "ActualHli".

Error type | -

## Notice

Only the first 12 characters of the version identifier are checked and if they are equal that’s sufficient consistence of the HLI interface at PLC and motion controller to interact together.