Based on the error description you provided, here is a possible question related to the solution:

What are the possible causes of the communication abnormality between front and rear segment machines in KM-ASSYH2-04, and what steps can be taken to address this issue?
The solution for the error described as Front segment-M7022-Communication abnormality between front segment and rear segment is typically to check and repair any loose connections, cables or components that may be causing the communication issue.