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The module of subsystem "Data acquisition" <DiamondBoards>

Module: DiamondBoards
Name: Diamond cards of data acquisition
Type: DAQ
Source: daq_DiamondBoards.so
Version: 2.1.0
Author: Roman Savochenko, Maxim Lysenko (2009)
Description: Provides an access to "Diamond Systems" DAQ boards. Includes main support for all generic boards.
License: GPL

Contents

Introduction

The module provides for the system OpenSCADA support of dynamic data sources, based on the cards for data acquisition of Diamond Systems company (http://diamondsystems.com). The module based on the universal driver of the manufacturer of the boards. Universal driver is available for almost all known software platforms in the form of a library. Universal driver has been received at http://www.diamondsystems.com/support/software and it was included in the distribution kit of OpenSCADA, therefore, for the building of the module external libraries are not required. You need only an assembling of the Linux kernel module "dscudkp.ko" for working by interrupts and with FIFO.


The boards of data acquisition of Diamond Systems represent the modules of expansion of the PC/104 form-factor. Boards may include: analog IO (input/outputs), digital IO, and counters. Complete set of cards can vary greatly. There can be contained only one type of IO or some mix. In addition, the function of data acquisition can be given to the system boards of this company. For example, the motherboard "Athena" contains: 16 AI, 4 AO, 24 DIO.


The module provides support for analog and digital IO into synchronous and asynchronous access modes. Analog inputs (AI) acquisition supports also into an interruption mode (by FIFO assistance). The method of the acquisition on interruption allows to achieve maximum frequency of interrogation which it is supported by the hardware. In the case of "Athena" system board the frequency achieves 100 kHz. In acquisition on interruption process the data becomes by packages of the main acquisition period and places into an archives buffer.


 (2 Kb) In version 2.0 the module was in fact rewrote for providing the support of all wide-range boards of data acquisition of firm Diamond Systems. The result module is first which supports operating into all three modes of the data acquisition (synchronous, asynchronous, by packets), addition to the module is first data acquisition module of OpenSCADA system.

1. Data controller's object

On the controller's object level creates generic task for all board-parameters processing. Example of the tab of configuration of the controller's object shown in Figure 1.


Tab of configuration of the controller's object. (101 Kb)
Fig.1. Tab of configuration of the controller's object.

In assistance with the tab you can set:

2. Parameter-board's object

A parameter-board's object same has a configuration of concrete board and provides available on the board data by attributes. Example of the tab "Parameter", configuration of the parameter-board at all, shown on Figure 2, and the tab "Configuration", signals properties, shown on Figure 3.


Tab "Parameter" of configuration of the parameter-board at all. (106 Kb)
Fig.2. Tab "Parameter" of configuration of the parameter-board at all.

In assistance with the tab you can set:

 (2 Kb) Real value of the field may be dropped to limit of the counter's frequency of service AI by interruption, on it recounting to a single channel.

Tab "Configuration" of the signal's properties. (105 Kb)
Fig.3. Tab "Configuration" of the signal's properties.

In assistance with the tab you can set:

 (2 Kb) In case of the requested samplerate and the interval too big then the result frequency may be dropped to a value got from the scan interval.

On the Figure 4 shown an example of tab "Attributes" for board "DMM-32x-AT".


Tab "Attributes" of a parameter-board. (126 Kb)
Fig.4. Tab "Attributes" of a parameter-board.

Into the table 1 shown a list of boards of firm "Diamond Systems", their support status and testing.


Table 1 Properties of firm "Diamond Systems" boards

Board AI (16 bit) AO (12 bit) DIO (x8) DI (x8) DO (x8) Notes
DMM-16 16 4 0 1 1
Ruby-MM 0 8 3 0 0
Opal-MM 0 0 0 1 1
DMM 16 (12 bit) 2 0 1 1
Pearl-MM 0 0 0 0 2
Onyx-MM 0 0 6 0 0
Ruby-MM-416 0 4 (16 bit) 2 0 0
DMM-AT 16 (12 bit, 100 kHz, 512 FIFO) 2 0 1 1
DMM-16-AT 16 (100 kHz, 512 FIFO) 4 0 1 1
IR104 0 0 0 3 3
Prometheus 16 (100 kHz, 48 FIFO) 4 3 0 0
Hercules EBX 32 (250 kHz, 2048 FIFO) 4 5 0 0
Onyx-MM-DIO 0 0 6 0 0
Mercator 0 0 3 0 0
Athena 16 (100 kHz, 48 FIFO) 4 3 0 0 Verified
DMM-32x(-AT) 32 (250 kHz, 1024 FIFO) 4 3 0 0
GPIO-MM-11[12](DIO) 0 0 6 0 0
GPIO-MM-21 0 0 12 0 0
Poseidon 32 (250 kHz, 1024 FIFO) 4 3 0 0
Athena-II 16 (100 kHz, 2048 FIFO) 4 3 0 0
DMM-32dx(-AT) 32 (250 kHz, 1024 FIFO) 4 3 0 0 Verified
Helios 16 (100 kHz, 2048 FIFO) 4 5 0 0
Neptune 32 (250 kHz, 1024 FIFO) 4 4 0 0

Translation in progress

Notes

Особливістю роботи збору AI за перериванням є синхронізація переключення каналів та вимірів за окремим, внутрішнім, лічильником та використання FIFO як проміжного буферу вимірювання. Звісно, що цей лічильник на деяке значення буде відрізнятися від лічильника реального часу, а FIFO потрібно встигати вичитувати. Природно що потрібне підлаштування-калібровка розходження надходження даних із годинником реального часу. В цілому реалізуються наступні механізми компенсації розходження лічильників та інших явищ:

Links

Used version the Linux driver from Diamond systems: dscud5.91linux.tar.gz
The patch for build driver at kernel Linux 2.6.29, used for data gathering by interrupt: lastkernels.patch


Referring pages: HomePageEn/Doc
HomePageEn/Doc/DAQ
HomePageEn/Function
HomePageEn/Using/PLC/firmware


 
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