Toshiba Programmable Logic Controller V200 - Manual (Page 123)

Page 115
7.7 Program Execution Sequence
The instructions execution sequence is shown below.
(1) They are executed in the sequence from block 1 through the final block which contains the END instruction (or
IRET in an interrupt program).
(2) They are executed in the sequence from rung 1 through the final rung in a block (or the END instruction).
(3) They are executed according to the following rules in any one rung.
1 W hen there is no vertical
connection, they are
executed from left to right.
2 W hen there is an OR
connection, the OR logic
portion is executed first.
3
W hen there is a branch, they
are executed in the order from
the upper line to the lower line.
1 2 3 4
1 2 4 6 7
3
5
1 2 3 4
5 6
4 A combination of
above. 2 and 3
1 3 4 5
2 6 8
7
The instructions execution sequence in which function instructions are included also follows the above rules. How-
ever, for program execution control instructions, such as jumps (JCS), loops (FOR-NEXT), subroutines (CALL-SUBR-
RET), it will depend on the specifications of each instruction.