If a module is configured to send local status responses, it sends the message to segment id 0 which works fine.
If it is configured to send global status responses, the message is targeted to segment 4 (all segments). A segment coupler in the same segment of PCHK will then replace the segment information with the local segment id.
However, if there is no segment coupler, segment id 4 has to be handled the same way as segment id 0. Therefore segment id 4 needs to be translated to the logical source address just as id 0.
alengwenus
commented
3 years ago
If a module is configured to send local status responses, it sends the message to segment id 0 which works fine.
If it is configured to send global status responses, the message is targeted to segment 4 (all segments). A segment coupler in the same segment of PCHK will then replace the segment information with the local segment id. However, if there is no segment coupler, segment id 4 has to be handled the same way as segment id 0. Therefore segment id 4 needs to be translated to the logical source address just as id 0.