Logic Stack Instructions - Siemens Simatic S7-200 System Manual

Programmable controller

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10.11 Logic Stack Instructions

S7-200 Programmable Controller System Manual

C79000-G7076-C230-02

The And Load instruction combines the values in the first and

second levels of the stack using a logical And operation. The

result is loaded in the top of stack. After the ALD is executed,

the stack depth is decreased by one.

The Or Load instruction combines the values in the first and

second levels of the stack, using a logical Or operation. The

result is loaded in the top of stack. After the OLD is executed,

the stack depth is decreased by one.

The Logic Push instruction duplicates the top value on the

stack and pushes this value onto the stack. The bottom of the

stack is pushed off and lost.

The Logic Read instruction copies the second stack value to

the top of stack. The stack is not pushed or popped, but the old

top of stack value is destroyed by the copy.

The Logic Pop instruction pops one value off of the stack. The

second stack value becomes the new top of stack value.

Instruction Set