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LOAD and LOAD NOT
The first condition that starts any logic block within a ladder diagram corre-
sponds to a LOAD or LOAD NOT instruction. Each of these instruction requires
one line of mnemonic code. “Instruction” is used as a dummy instruction in the
following examples and could be any of the right-hand instructions described lat-
er in this manual.
00000
00000
A LOAD instruction.
A LOAD NOT instruction.
Address
Instruction
Operands
00000
LD
00000
00001
Instruction
00002
LD NOT
00000
00003
Instruction
When this is the only condition on the instruction line, the execution condition for
the instruction at the right is ON when the condition is ON. For the LOAD instruc-
tion (i.e., a normally open condition), the execution condition will be ON when IR
00000 is ON; for the LOAD NOT instruction (i.e., a normally closed condition), it
will be ON when 00000 is OFF.
AND and AND NOT
When two or more conditions lie in series on the same instruction line, the first
one corresponds to a LOAD or LOAD NOT instruction; and the rest of the condi-
tions correspond to AND or AND NOT instructions. The following example
shows three conditions which correspond in order from the left to a LOAD, an
AND NOT, and an AND instruction. Again, each of these instructions requires
one line of mnemonic code.
00000
00100
LR 0000
Instruction
Address
Instruction
Operands
00000
LD
00000
00001
AND NOT
00100
00002
AND
LR
0000
00003
Instruction
The instruction will have an ON execution condition only when all three condi-
tions are ON, i.e., when IR 00000 is ON, IR 00100 is OFF, and LR 0000 is ON.
AND instructions in series can be considered individually, with each taking the
logical AND of the execution condition (i.e., the total of all conditions up to that
point) and the status of the AND instruction’s operand bit. If both of these are ON,
an ON execution condition will be produced for the next instruction. If either is
OFF, the result will also be OFF. The execution condition for the first AND in-
struction in a series is the first condition on the instruction line.
Each AND NOT instruction in series takes the logical AND of its execution condi-
tion and the inverse of its operand bit.
Basic Ladder Diagrams
Section 4-4
Содержание SYSMAC C200HS
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Страница 2: ...C200HS Programmable Controllers Operation Manual Revised February 2002...
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Страница 379: ...371 SR word Corresponding key s Bit 279 03 04 05 3 06 07 VER 08 09 Monitoring Operation and Modifying Data Section 7 1...
Страница 470: ...468 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage...
Страница 471: ...469 Programmer Program Date Page TC address T or C Set value Notes TC address T or C Set value Notes Timers and Counters...