Siemens PLC logic operation instructions - Solutions - Huaqiang Electronic Network

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The Siemens S7 series PLC logic operation instructions are essential for programming and controlling automation systems. Below are the key byte, word, and double-word logical operations:

Byte Logical Operation Instructions
ANDB IN1, OUT
This instruction performs a bitwise AND operation between the byte values of IN1 and OUT, storing the result in OUT. The operands can be VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *AC, or *LD. Constants can also be used as inputs.

ORB IN1, OUT
This instruction performs a bitwise OR operation between the byte values of IN1 and OUT, storing the result in OUT.

XORB IN1, OUT
This instruction performs a bitwise XOR operation between the byte values of IN1 and OUT, storing the result in OUT.

INVB OUT
This instruction inverts each bit of the byte value in OUT, effectively performing a NOT operation on the entire byte.

Word Logic Operation Instructions
ANDW IN1, OUT
This instruction performs a bitwise AND operation between the word values of IN1 and OUT, storing the result in OUT. Valid operands include VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, or *LD. Constants and AIW can also be used.

ORW IN1, OUT
This instruction performs a bitwise OR operation between the word values of IN1 and OUT, storing the result in OUT.

XORW IN1, OUT
This instruction performs a bitwise XOR operation between the word values of IN1 and OUT, storing the result in OUT.

INVW OUT
This instruction inverts each bit of the word value in OUT, effectively performing a NOT operation on the entire word.

Double Word Logic Operation Instructions
ANDD IN1, OUT
This instruction performs a bitwise AND operation between the double-word values of IN1 and OUT, storing the result in OUT. Operands can be VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, or *LD. HC and constants are also supported.

ORD IN1, OUT
This instruction performs a bitwise OR operation between the double-word values of IN1 and OUT, storing the result in OUT.

XORD IN1, OUT
This instruction performs a bitwise XOR operation between the double-word values of IN1 and OUT, storing the result in OUT.

INVD OUT
This instruction inverts each bit of the double-word value in OUT, effectively performing a NOT operation on the entire double word.

These instructions are fundamental in building complex control logic in Siemens S7 PLCs, allowing precise manipulation of binary data for various industrial applications.

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