Omron C40K 用户手册

When program execution is started, the CPU cycles the program from top to
bottom, checking all conditions and executing all instructions accordingly as it
moves down the bus bar. It is important that instructions be placed in the
proper order so that, for example, the desired data is moved to a word before
that word is used as the operand for an instruction. Remember that an in-
struction line is completed to the terminal instruction at the right before exe-
cuting any instruction lines branching from the first instruction line to other
terminal instructions at the right.

Program execution is only one of the tasks carried out by the CPU as part of
the cycle time. Refer to