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Analog value representation

4.1

Introduction

Electronic modules with analog outputs

With the electronic module with analog inputs, continuously variable signals, such as those

occurring in temperature measurement and resistance measurement, can be acquired,

evaluated, and converted to digital values for further processing.

4.2

Analog value representation for measuring range with SIMATIC S7

Analog value representation

With the same nominal range, the digitized analog value is the same for input and output

values. Analog values are represented in two's complement.

The following table shows the analog value representation of the analog electronic modules.

Table 4-1

Analog value representation (SIMATIC S7 format)

Resolution

Bit number

Significance of the bits

Sign

The sign (S) of the analog value is always in bit number 15:

● "0" → +

● "1" → –

2AI TC ST analog electronic module (6ES7134-4JB00-0AB0)

Manual, 04/2007, A5E01076883-01

Analog value