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How to Use the Step Ladder Program Block Appendix A
• A single sequence command (e.g. LOAD or OUT) is described to a single ITEM, and the block address
and ITEM number of the specified input/output destination are described at the same time as the operand.
• There are two types of sequence command, basic instructions, and sequence control instructions. Basic
instructions can be used only in logical sequences comprising single steps, and sequence control instruc-
tions can be used in step sequences comprising multiple steps.
• ITEMs that can be specified by sequence commands are ITEMs whose ITEM category is “contact input” or
“contact output.” For details, refer to the reading and writing method indicated in the ITEM list under the
function block descriptions in the Function Block Reference Manual (Cat. No. W407).
Command type Settable ITEM type “According to Step Ladder Program” at “Reading and
Writing Method” Item
Input type commands such as LOAD Contact output R (read-enabled)
Contact input R/W (read/write-enabled)
Output type commands such as OUT Contact input
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