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.
o1 analog input
oDifferential input type
oBridge factor ±2...±256 mV/Vdc, configurable via the ADC configuration register (Configuration output 00)
oSensor operating range 85...5,000 Ω�
o24-bit digital resolution
oMax. four parallel full bridges
oWiring type four or six wires
Parameterizing the Module Via PLC Configuration
|
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 |
|||
|
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 |
|
DMS value This is the raw value of the analog/digital converter read from the TM5SEAISG. |
– |
DINT |
|
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.
