70
Instruction
0408
Instruction
Diagram A
Diagram B
Address Instruction Operands
000 LD 0408
001 Instruction
There are a few exceptions to this rule, including the INTERLOCK CLEAR
and step instructions. Each of these instructions is used as the second of a
pair of instructions and is controlled by the execution condition of the first of
the pair. Conditions should not be placed on the instruction lines leading to
these instructions.
When drawing ladder diagrams, it is important to keep in mind the number of
instructions that will be required to input it. In diagram A, below, an OR LOAD
instruction will be required to combine the top and bottom instruction lines.
This can be avoided by redrawing as shown in diagram B so that no AND
LOAD or OR LOAD instructions are required. Refer to 3-7-6 AND LOAD and
OR LOAD for more details.
0000
0001 0107
0107
0001
0000
0107
0107
Diagram A
Diagram B
Address Instruction Operands
000 LD 0000
001 LD 0001
002 AND 0107
003 OR LD ---
004 OUT 0107
Address Instruction Operands
000 LD 0001
001 AND 0107
002 OR 0000
003 OUT 0107
Advanced Programming Section 3-6
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