Execute Program:
PLCs generally will solve the logic from left to right, top to bottom. The output of the rung before is available for the next rung.
This is like some of the popular bands of PLCs like Mitsubishi, Allen Bradley, Siemens, Omron, Automation Direct, etc. There are some exceptions like older Modicon(SCADAPACK) models which solve the logic top to bottom, left to right. Always refer to the manufactures manual to ensure the program execution method.