Siemens Simatic S7-200 System Manual page 288

Programmable controller

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Table of Contents

Instruction Set

Logic Stack Operations

Figure 10-46 illustrates the operation of the And Load and Or Load instructions.

AND the top two stack values

Figure 10-46

Figure 10-47 illustrates the operation of the Logic Push, Logic Read, and Logic Pop

instructions.

Figure 10-47

S0 = iv0 AND iv1

Note: x means the value is unknown (it may be either a 0 or a 1).

And Load and Or Load Instructions

Note: x means the value is unknown (it may be either a 0 or a 1).

Upon the LPS execution, iv8 is lost.

Logic Push, Logic Read, and Logic Pop Instructions

OR the top two stack values

S7-200 Programmable Controller System Manual

C79000-G7076-C230-02

S0 = iv0 OR iv1