![]() Another instruction might be: OUT Q to indicate that there is to be an output to Q. In terms of ladder diagrams, an operator may be regarded as a ladder element, and LD is equivalent to starting a rung with open contacts for input A. Thus we might have: LD A to indicate that the operand A is to be loaded, LD being the operator used to indicate loading. Each instruction consists of an operator followed by one or more operands, that is, the subjects of the operator. An instruction list gives programs as a series of instructions, with each instruction on a new line. ![]() A programming method that can be considered to be the entering of a ladder programing text is the instruction list (IL).
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