REX640 PCL2 Protection Relay Firmware Release 1.1.5

This release note details firmware version 1.1.5 for ABB REX640 PCL2 protection relays and LHMIs, specifying prerequisites such as PCL2 product connectivity level, firmware version 1.1.4 or earlier, and an LHMI application version before 20-05-27-08:27. It outlines implemented usability and operational improvements, including enhancements to binary signal transfer (BSTGAPC), DNP3 Secure Authentication, IEC 61850 quality bit behavior, PTP time synchronization, HSR/PRP supervision frame stability, and WHMI user account management.