Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 268)

B-2

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

B.1 Overview

Each ladder logic instruction described in this manual triggers a specific

operation. When you combine these instructions into a program, you can

accomplish a wide variety of automation tasks. This chapter provides the

following examples of practical applications of the ladder logic instructions:

S Controlling a conveyor belt using bit logic instructions

S Detecting direction of movement on a conveyor belt using bit logic

instructions

S Generating a clock pulse using timer instructions

S Keeping track of storage space using counter and comparison instructions

S Solving a problem using integer math instructions

S Setting the length of time for heating an oven

The examples in this chapter use the following instructions:

S Add Integer (ADD_I)

S Assign a Value (MOVE)

S Compare Integer (CMP_I>=)

S Compare Integer (CMP_I<=)

S Divide Integer (DIV_I)

S Down Counter Coil ––( CD )

S Extended Pulse Timer Coil ––( SE )––

S Jump-If-Not ––( JMPN )––

S Multiply Integer (MUL_I)

S Normally Closed Contact ––| / |––

S Normally Open Contact ––| |––

S Output Coil ––( )

S Positive RLO Edge Detection ––( P )––

S Reset Coil ––( R )

S Return ––( RET )

S Set Coil ––( S )

S Up Counter Coil ––( CU )

S (Word) And Word (WAND_W)

S (Word) Or Word (WOR_W)

Practical

Applications

Instructions Used

Programming Examples

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Siemens NAN 67 Series Manual de servicio Pagina 268