I would like to see your logical opinion about this situation and in which part of system where I need to find solution - software or in the physical field.
Subject: Twelve old system based on Mitsubishi PLC AnS series, Profibus
Here is pneumatic transport, with 5 lines, each line have a shredder and discharge valve.
A few months ago, when line 1 works , display shows line 2 and vice versa, it was first problem, but the system was still working.
From the last week system doesn't work. On the display appear line 3 in works, but system can not started. Alarm shows Double address (perhaps two valves have some address), Alarm still appear after reset and even all lines are turned off.
What is your opinion where to find proble (PLC, I/O moduls, cables,...)