Multiple devices with the same Individual Address

Problem

Multiple devices with the same Individual Address are shown in the diagnostics 'Programming Mode' (e.g. 1.1.12 *5)

Resolution

Multiple devices with the same address always point to a topological problem (a loop in the bus line, faulty addressing). The addresses 15.15.255/15.15.0 are an exception - these are initial device addresses when no assignment has been made yet (fabrication, out of the box) or if an existing one was reset.