cnrservices
Member
I have a lot of experience on SLC500's and now have to troubleshoot a few PLC5's. I picked up on most of the operation, but one of the 5's (running a plating line) has an oddity I haven't figured out & was wondering if someone could shed some light on.
This is a PLC5/30 with 6 racks, consiting of 4 ladder files - but nowhere in ladder 2 is there a JMP or JSR command, so how is the PLC going to the other 3 ladders (they ARE being processed or the line wouldn't run) All the other PLC5's use JMP's for other ladders.
Is there some other way? I have attached a ZIP of ladder 2.
This is a PLC5/30 with 6 racks, consiting of 4 ladder files - but nowhere in ladder 2 is there a JMP or JSR command, so how is the PLC going to the other 3 ladders (they ARE being processed or the line wouldn't run) All the other PLC5's use JMP's for other ladders.
Is there some other way? I have attached a ZIP of ladder 2.