Siemens Simatic S7-300 Manual - Page 24

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Measuring ranges

You perform the setting of the measuring ranges by means of the measuring range

modules on the module and with the "measuring method" parameter in STEP 7.

Table 10

Measuring ranges of the SM 331; AI 8 x 14 Bit High Speed

Method Selected

U: voltage

4DMU: Current (4-wire

transmitter)

2DMU: Current (2-wire

transmitter)

Default Settings

The default settings of the module in STEP 7 are the "voltage" measuring method

and the "" 10 V" measuring range. You can use this measuring method with this

measuring range without parameterizing the SM 331; AI 8

using STEP 7.

Special characteristics of the wire-break check for the 4 to 20 mA measuring

range

With a parameterized measuring range of 4 to 20 mA and enabled wire-break

check, the analog input module enters wire-break in the diagnosis when a current

falls below 3.6 mA.

If you have enabled diagnostics interrupt during configuration, the module

additionally triggers a diagnostic interrupt.

If no diagnostic interrupt has been enabled, the illuminated SF LED is the only

indication of the wire-break and you must evaluate the diagnostic bytes in the user

program.

With a parameterized measuring range of 4 to 20 mA and disabled wire-break

check and enabled diagnostic interrupt, the module triggers a diagnostic interrupt

when the underflow is reached.

Measuring Range

(Type of Sensor)

" 1 V

" 5 V

1 to 5 V

" 10 V

0 to 20 mA

4 to 20 mA

" 20 mA

4 to 20 mA

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

Measuring Range

Module Setting

You will find the digitized analog

values in Section 4.3.1 of the

reference manual in the part that

deals with the voltage measuring

range.

You will find the digitized analog

values in Section 4.3.1 of the

reference manual in the part that

deals with the current measuring

range.

Description

14 Bit High Speed

A5E00213444-02