Chapter 6: Instructions 57
How to Read the Description of Instructions
Each instruction is explained in three parts: the instruction itself, its ladder diagram, and a description.
This section explains how to read the instructions.
Sample Instruction
Mnemonic
Substitution Formula
(Assignment expression)
Range
Bit
■ Byte
LET
DLET
Direct substitution of number
(direct output of number)
■ Word
Explanation of Codes
= unavailable option
■ = available option
$xx indicates a hexadecimal number.
Explanation of Table
• Mnemonic—A byte (single mode) instruction, D designates word (double mode) instruction.
• Assignment expression—Description of the instruction.
• Range—Size of data that can be used by this instruction.
Sample Ladder
D: Destination
S: Source
Example: S = M0, and M0 is 123
D = R17, and R17 is 45
Before execution: M0 = 123, R17 = 45
After execution: M0 = 123, R17 = 123
Explanation of Ladder
The ladder diagram shows the structure of the instruction as it is displayed. Additional text typically
gives an example and explains the processing structure.
LET
D =
S =
R
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