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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

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.

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.

Fig.1. Tab of configuration of the controller's object.

In assistance with the tab you can set:

• The controller status, that is: state, states "Enabled" and "Started" and DB name with the configuration.
• Identifier, name and description of the controller's object.
• Status, in which the controller is to be switched at the boot time: "Enabled" and "Started".
• The table name for storing here of the controller's parameters configuration.
• Data acquisition task's scheduling policy and execution priority.

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.

Fig.2. Tab "Parameter" of configuration of the parameter-board at all.

Revision in progress

In assistance with the tab you can set:

• The parameter status, that is: type and status "Enabled".
• Identifier, name and description of the parameter's object.
• Status, in which the parameter is to be switched at the boot time: "Enabled".
• Type, address and vector of interruption of the board. The interruption vector allowed only for boards with the analog inputs and FIFO.
• Samplerate to single channel on the analog inputs acquisition by interrupt. Allowed only for boards with analog inputs and FIFO. Nonzero and correct value into this and previous field will enable the AI acquisition mode by interruption.

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.

• Ðåæèì àñèíõðîííîãî ÷èòàííÿ, ç ïåð³îäîì îá'ºêòà êîíòðîëåðà. Ïðàöþº ³ ó ðåæèì³ îïèòóâàííÿ AI çà ïåðåðèâàííÿìè äëÿ äèñêðåòíèõ ñèãíàë³â.
• Ðåæèì â³äîáðàæåííÿ çíà÷åííÿ àíàëîãîâèõ âõîä³â: "Êîä ÀÖÏ (ö³ëå)", "³äñîòîê â³ä øêàëè ñèãíàëó (ðåàëüíå)" òà "Íàïðóãà (ðåàëüíå)". Ðåæèì "Íàïðóãà" ìîæå áóòè äîñòóïíèé íå äëÿ âñ³õ ïëàò!
• Îáìåæåííÿ íà ê³ëüê³ñòü àíàëîãîâèõ ïàðàìåòð³â ùî îáðîáëÿþòüñÿ. Êîðèñíî ïðè âèêîðèñòàíí³ ìåíøî¿ ê³ëüêîñò³ êàíàë³â, àëå ÷àñò³øå. Îñîáëèâî ó ðåæèì³ îïèòóâàííÿ çà ïåðåðèâàííÿì òà êåðóâàííÿ ðåæèìîì êàíàëó SE(single-ended) òà "Differential".

In the mode of direct interrogation of analog inputs hardware interrupt of the card, frequency of analog inputs interrogation and the strengthening of the analog converter are not available.

To configure ports of digital inputs / outputs on the controller's page there is the tab of the configuration (fig. 2).

2. Parameters of the Diamond controller

Module provides the information on two types of parameters: the digital and analog. Each type of the parameter is stored in the database and, consequently, has its own tab configuration. Tab of the configuration of analog parameters is presented in Fig.3. Configuration tab of digital parameters is presented in Fig.4.

Using the form of configuration of analog parameters it can be set:

• Mode of the parameter, namely "Enabled" and type of the parameter.
• Id, name and description of the parameter.
• The state in which the parameter is to be transfered at boot time: "To enable".
• The orientation of the parameter — "Input" or "Output".
• Physical channel of the parameter.
• Strengthening of the channel in the case of input(for direct interrogation).

To access the values of analog parameters are attributes must be formed. For analog inputs:

• the percentage value (value);
• input voltage (voltage);
• ADÑ code (code).

For analog outputs are set:

• the percentage value (value);
• output voltage (voltage).

Using the Configuration tab of digital parameters there can be set:

• Mode of the parameter, namely, "Enable" and the type of parameter.
• Id, name and description of the parameter.
• The state in which the parameter is to be transfered at boot time: "To enabled".
• The orientation of the parameter — "Input" or "Output".
• Physical port and number of the channel.

To access the values of digital parameters the attribute, which provides the input value or inserts the new one, must be formed.

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