order of operation for 5000

[73project 0]

Can someone describe the order of operation for the following rung in the attached file? Does a branch execute at the same time as the main rung? Sorry about the beginner question, but I'm having a hard time following what happens when.

[TConnolly 13]

Double click on the rung number. This will open the mnemonic editor. Instructions will execute in the order shown in the mnemonic editor. The BST instruction marks the beginning of a branch. NXB moves execution to the next branch, BND marks the end of a branch. All of the other instructions should be self evident.

[b_carlton 61]

See red numbers in your modified picture

[73project 0]

Thanks for the help! I tried some searches on the web, but never got close to what I was looking for. Thanks again!!

[73project 0]

Thanks for the tip Alaric!

[dmargineau 6]

Just a reminder... Within a Logix system, unless "bracketed" by a UID/UIE (User Interrupt Disable/User Interrupt Enable ) pair of instructions, any rung scan could be halted when a higher priority task routine is being called up. After the completion of the higher priority tasks routines, the lower priority (interrupted) ones will resume from the stoppage step in the left-to-right, up-to-down order. When Periodic (Scheduled)Tasks or Motion Instructions are being used, careful considerations should be taken when programming the Logix system's logic. Within a PAC system the "LAST ONE WINS" approach is history!