General

Description

The analog input module allows converting the output of a 4-wire or 6-wire full-bridge strain gauge to a numeric value.

The full-bridge strain gauge sensor provides an electrical signal that the TM5SEAISG module converts to a raw numerical value.

The raw value is then processed with the use of the StrainGaugeExt function block which provides a calibrated value. The average raw value is calculated with the the measures done by the TM5SEAISG module during a define number of task cycles (see TM5 IoDrvTM5SEAISG Strain Gauge Library Guide).

If a 6-wire strain gauge cell is connected, the line compensation no longer functions.This module concept requires compensation in the measurement system. This compensation removes the uncertainty in the measurement circuit, such as component tolerances, effective bridge voltage, or zero offset. The measurement precision refers to the absolute (compensated) value, which will only change as a result of changes in the operating temperature.

The module (24 Vdc) has an input with a 24-bit digital converter resolution.

  • 1 analog input

  • Differential input type

  • Bridge factor ±2...±256 mV/Vdc, configurable via the ADC configuration register (Configuration output 00)

  • Sensor operating range 85...5,000 Ω�

  • 24-bit digital resolution

  • Max. four parallel full bridges

  • Wiring type four or six wires

Parameterizing the Module Via PLC Configuration

In order to parameterize a module per PLC Configuration in the device editor, proceed as follows:

Step

Action

1

Append module in the Devices tree beneath a Sercos III bus interface (TM5NS31).

2

Afterwards double-click the module in the Devices tree.

Result: The device editor is opened and the tabs Sercos III Module I/O display, User-defined parameters, and Information are displayed.

Sercos III Module I/O Mapping Tab

The input and output channels of the module are displayed on project variables that are used by the application.

Channel

Meaning

Default value

Data type

Outputs

Configuration output 00

Analog/Digital converter (ADC) configuration

–

USINT

Inputs

ModuleOK

–

BYTE

DcOk

The power supply in the valid range:

0 = Invalid,

1 = Valid

–

BOOL

Reserved

Reserved

–

BOOL

NetworkOK

TM5 bus:

0 = Not OK,

1 = OK

–

BOOL

I/O data valid

I/O data:

0 = Valid,

1 = Invalid

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

StatusInput00 (module status)

–

USINT

ADC value

0 = ADC value is valid,

1 = ADC value is invalid

–

BOOL

Wire break

0 = No error detected,

1 = Wire breaks detected

–

BOOL

ADC mode

0 = ADC is executed synchronously with the TM5 bus,

1 = ADC is not executed synchronously with the TM5 bus.

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

Reserved

Reserved

–

BOOL

Analog input 00

DMS value

This is the raw value of the analog/digital converter read from the TM5SEAISG.

–

DINT

User Parameters Tab

The change over between numerical and symbolical value takes place via the check box Symbolic values.

Name

Meaning

Default value

Data type

ADCCycletime

Indicates the cycle time (in μs) for the ADC (analog/digital converter).

400

BitArea

For further information, see the TM5 analog I/O modules hardware manual.