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Functions of the IM 151-7 CPU

8-20

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

8.4.3 Address areas

Overview

The system memory of the IM 151-7 CPU id divided into address areas (see the

table below). In your program, you use the appropriate operations to address the

data directly in the respective address area.

Table 8-9 Address areas of the system memory

Address area

Description

Process image of the inputs At the beginning of each OB 1 cycle, the IM 151-7 CPU

reads the inputs out of the input modules and stores the

values in the process image of the inputs.

Process image of the outputs During the cycle, the program calculates the values for the

outputs and stores them in the process image of the

outputs. At the end of the OB 1 cycle, the IM 151-7 CPU

writes the calculated output values to the output modules.

Memory markers This area provides memory for intermediate results

calculated in the program.

Timers Timers are available in this area.

Counter Counters are available in this area.

Local data This memory area records the temporary data of a code

block (OB, FB, FC) during the period in which this block is

being processed.

Data blocks See Section 8.4.4

The Instruction list tells you which address areas are possible with your CPU.

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 213 214

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Siemens ET 7Y Series Especificaciones Pagina 132