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Item parameter contains the configuration and information of how to communicate to a certain destination on a parent instance such as variable, tunnel, backend, plc tag and data point. Each item can be configured to follow some defaults which was set when adding the parent instance such as reading interval and store time but they can also be configured individually.
The general parameters are everything that relates to the instance such as address and description.
|Name of the item such as "Bottle counter" if the item describes a variable that counts bottles in factory or "Device-to-cloud" if the item is a tunnel to the cloud.
|Unique ID (UID) is a unique reference to an item or instance. The UID can be referred to in various places such as parameters, mappings and scripting by calling it by %UID%. E.g. calling the name of an item where BOTTLE_CNT is the UID is done by %BOTTLE_CNT.NAME%.
|Description of the item. E.g. "Bottle counter for Machine 5" or "Data ingest backend"
|Unit of the measured value. E.g. "bottles", "kWh"
|Enable or disable the item
Defines if the item is a read only, write only or read-write. The user interface will change accordingly for the item reflecting the specific setting.
The setup parameters are parameters that relates to reading, storage and how SIA should handle it. These parameters will also be used as the default for the items when you are creating items under the instance.
Selects what mode the item should use:
Sets the interval in which SIA Connect should poll for data:
Store time for the logged data. After the data for the item have been kept in history for the given time it will be deleted.
|Max samples to store
The amount of data samples to store in the history for an item. This is a FIFO buffer, so when the amount is reached the oldest data samples will be deleted.
The trigger defines when a data sample is triggering the execution of a mapping or when the sample are triggered to be stored in the history.
|A cyclic interval that defines when to update and sample values in case the Trigger behaviour have not triggered an update.
As an example. Trigger behaviour is set to All changes and Minimum interval is set to 2 minutes. If no update on the value have occurred in the 2 minutes the system will force a update of the value each 2 minute or 2 minutes after the latest trigger have occurred.
When data is written to the item, the input template is applied to the raw data.
This is used when creating payloads or insert statements with SIA Connect scripting variables
Please refer to Use post-processing of samples for further information and examples