Configuration of communication with
eWON.
This preconfiguration can be activated when creating a new object (e.g. by
"New object ..." in the local object menu or after pressing the
Insert key after selecting the object) and is included in the group:
" / Communication / eWON - PLC device".
This preconfiguration can be created in the object:
PmaFolder or
PmaRoot.
The preconfiguration creates an object of the
PmaFolder type containing three
subfolders:
View - allows processing data in requested range from individual devices that are stored in cloud service Talk2M DataMailbox
Trend - allows reading and local storage of complete history of selected values from devices registered in the cloud service
Cfg - creates administration screen that can be used in order to create configuration file for trending selected values
In the
"GetAuthentication" method of the main
eWon folder there are all login entries requested for cloud service access.
View -
PmaFolder The "
PanelTest" test panel is used for displaying received data. Here it is possible to use the configurators in order to put together requested method and command parameter. The
PanelTrend object allows rendering graphic chart of data in defined time-range.
The
PmaFolder object has methods
RequestEwons,
RequestEwon,
RequestData and
RequestSyncdata that are used to initiate the communication. Each of these methods call the
Add method of the
PmaSequencer object together with corresponding parameters. It triggers the
onStep event of the
PmaSequencer object where the
HttpRequest object executes the communication with the service. The received data is then processed by methods
ReplyEwons,
ReplyEwon,
ReplyData and
ReplySyncdata that must be modified accordingly.
Cfg -
PmaFolder Subobjects in this folder can be used to select values that will be read and saved locally into a trend database table. The
CfgTrend panel is used for data selection and configuration. Once the configuration is saved, new file named "
EwonCfgTrend.txt" is created in the
Cfg folder of the application. The content of such file is necessary for correct functionality of subobjects located in the
Trend object. These subobjects are responsible for saving selected values into trends.
Trend -
PmaFolder Subobjects in this folder are responsible for communication and saving selected values into trends. The configuration file
EwonCfgTrend.txt is necessary for their correct functionality. The file contains
JSon data created by the
CfgTrend panel. If increasing the number of trended values is needed, it can be done by opening the application in the development environment and copying the
TrendVar1 object in the
Trend object.
Once the communication is launched for the first time the application starts reading all historical data (stored in the cloud) of variables defined in the configuration file. The order of variables is respected. The data is read and stored continuously from the oldes to the newest. The application reads batches of 200 records every 0.5 seconds (after the previous batch is processed). Once one variable is fully read then another follows. This process may take significant ammount of time based on the total ammount of data to be read. Once all the data is read and saved locally following communication is planned for the time defined in the
DataCfg object in the
Period variable. This value defines for how many seconds the system waits (after the previous communication ends) before the next reading of data from the cloud is initiated.
These configurators can be set before the preconfiguration is created:
| The name of created object | Name of the object created in the tree of Pma objects. The maximum name length is 30 characters. This is a system name, so it must contain only alphanumeric and must not contain any diacritics, empty string, spaces and the first character must not be a number.
Default: "eWon" |
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|
| Service account identifier | assigned identification code of service account |
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| Account name | User account name |
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| User | Account login name |
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| Password | Account login password |
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| Object scripting language | Application object scripting language 0 - vbscript 1 - javascript |
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| Demonstration of communication and data processing | Creates View folder for demonstration and testing of communication and data processing |
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| Save selected values into trends | Creates folders Trend and Cfg for configuration and trending of selected values |
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| Number of trended values | Planned number of trended values |
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| Data reading time period | The period (in seconds) of repeated data reading 10 min 15 min 30 min 1 hour 2 hour 1 day |
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