ALPHA-VISION® Info: Transmitter

Transmitter

SUMMARY

Transmitter are needed for analog Measuring Points only and are mainly used when creating an AbvSpu Database.

CONTENTS

1. Introduction
2. Create TransmitterLists
3. Delete/ Modify/ Create/ Transmitter
4. Properties
5. Example of use

Introduction

That Data Object Class is mainly used for creating an AbvSpu Database. Only the name of the transmitter is written to the "_ifadr" field of the "_mp.dbf" of the analog Measuring Point.

• Transmitter are combined in TransmitterLists.
• TransmitterLists got the extension ".trm.xml"

• Create TransmitterLists.
  
  
• Create Transmitter within TransmitterLists.
• Modify Transmitter within TransmitterLists.
• Delete Transmitter within TransmitterLists.

Create TransmitterLists

Recommendation:
Create a subfolder called "Transmitter" in the Project folder.

In the pull down menu ‘File’ of the toolbar - select "new".
In the opened window select the item “TransmitterList”.
Input the wanted name in the ‘Name’ –field and the wanted location below.

Finish with OK.



Information about entries in the fields you will find down below under the headline ‘properties’.

Delete/ Modify/ Create/ Transmitter

Open the wanted TransmitterList via double-click.

• In the center window the Transmitter of the TransmitterList are shown.
• The right window shows the properties of the TransmitterList itself.

In the toolbar are the actions ‘apply’, ‘reset’ and ‘new Object’ operable.

Select the wanted Transmitter in the center window.

• The right window shows the definitions for that Transmitter.
• The 'delete' symbol in the toolbar becomes operable.

Click the 'delete' symbol in the toolbar.

• In the center window the entry is deleted.
• The right window is empty.

If on closing the file the modification is confirmed, the deletion is final.

Select the wanted Transmitter in the center window.

• The right window shows the definitions for that Transmitter.

In the right window you may modify the definitions.

• The field name of a modified field is marked with an asterisk.
• If the symbol ‘Apply’ is clicked the asterisk disappears.

If on closing the file the modification is confirmed, the change is final.

Information about entries in the fields you will find down below under the headline ‘properties’.

Select ‘New Object’ in the toolbar.
A Transmitter is created.

• The system places the default name transN (N stands for the running number)

If on closing the file the modification is confirmed, the newly created Transmitter is saved.

Information about entries in the fields you will find below under the headline ‘properties’.

Properties

List name:	TransmitterList
File extension:	.trm.xml
Objects:	Transmitter

Field (Name in Refresh- Actionscript & XML-Files)	Description	assosiated VisuNT-Field (max.Lenght)
Name (Name)	Name of the TransmitterList	non-existent
Description	free Text	non-existent

Field (Name in Refresh- Actionscript & XML-File)	Description	assosiated VisuNT-Field (max.Lenght)
Name (Name)	Name of the Transmitter	_mp.dbf: _ifadr (13)
Description	free Text	non-existent
Hardware modul type (HardwareModuleType)	type: 0/1/2/16/17	non-existen
Lower Limit (LowerLimit)	linare standardisation / OutOfRange-detection: Start value	non-existen
Lower Offset (LowerOffset)	Offset for lower limit	non-existen
Upper Limit (UpperLimit)	linare standardisation / OutOfRange-detection: End value	non-existen
Upper Offset (UpperOffset)	Offset for upper Limit	non-existen

- Analog Out
- Analog In (smoothed)
- Analog In
- Int
- Real

Example of use

Via Transmitter nearly all transducer types can be defined, e.g. analog transducer with 0–10 V, 0-20 mA, 4-20 mA, etc.
Via the transmitter data the interface between the physical transducer and the input data (Raw counts) needed for processing is defined.
In the following Table the conversion from transducer to DataObject values are shown.

Description	Range start	Range end	remark
phys. Sensor	0	6	Bar
electr. Signal	4	20	mA
Resolution of the input module: 10 Bit	0	1023	Counts
setting of the module	0 = 0	20 = 760	mA = Counts
phys. Range	152	760	counts, equates 0-6 Bar (4 mA = 0 Bar)

According to manufacturer specification the transducer works faultless in the range from 2 to 24 mA, i.e. an “out of Range” –error should be reported beyond that limits.
To define that transducer the Transmitter data should show the following:

Name	4_20mA
Description	Pressure sensor 0-6 Bar
Hardware modul typ	Analog In (smoothed)
lower limit	152	equates range start: 4 mA at 38 Counts per mA
upper limit	760	equates range end: 20 mA at 38 Counts pro mA
lower Offset	-76	Measuring Range starts 2 mA below Range Start
upper Offset	152	Measuring Range ends 4 mA above Range End

The scaling of 0-6 Bar is defined at the measuring points itself, since the transducer may be shared.

For scaling of the physical measuring value a linear equation is used which is definite by 2 points:
P1 (lower limit, measuring range start), in the example P1(152,0)
P2 (upper limit, measuring range end), in the example P2(760,6)

For the OOR (OutOfRange)–definition the following algorithm is used:
Underflow = lower limit + lower Offset
Overflow = upper limit + upper Offset
OOR (Sensor failure) Sensor failure is triggered by Underflow or Overflow and is equivalent to Status 16.