Siemens Simatic S7-300 Handbuch - Seite 20

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2.2

Commissioning the SM 331; AI 8

You specify how the SM 331; AI 8

measurement range modules on the module and STEP 7.

Measuring range modules

If necessary, the measuring range modules must be replugged to change the

measuring method and the measuring range. You then have to switch the 24 V

supply off and on again at the front connector. Section 4.4 of the reference manual

provides a detailed description of how to do this.

Section 4.20.3 of the reference manual contains a table indicating the settings to

be selected for different measurement methods and ranges. The required settings

are also printed on the module.

Default settings for measuring range module

The measuring range modules are preset to "B" (voltage; " 10 V) when the

module is supplied.

To use the following preset measuring methods and measuring ranges, you only

have to change the measuring range module to the corresponding setting.

Parameter assignment in STEP 7 is not necessary.

Table 7

Measuring Range

Module Setting

You must short-circuit unused channels and connect them to M

Defaults of the SM 331; AI 8

modules

Four-wire transmitter

Product Information on the Manual S7-300 Module Specifications, Edition 11/2002

14 Bit High Speed

14 Bit High Speed is to work by means of

14 Bit High Speed via measuring range

Measuring Method

Voltage

Current,

Two-wire transmitter

Measuring Range

" 1 V*

" 10 V

4 to 20 mA

ANA

A5E00213444-02