A table object provides a number of features and possibilities. This topic provides an overview of the table-specific characteristics.
Each object type has its own type-specific properties. The table-specific properties can be viewed on the Table tab in the object properties dialog box. The most important ones are:
| Property | Description |
|---|---|
| Name/Value |
In the Show Properties example, the oxygen uptake in a tank is monitored at four different locations and the results are shown in a table as the values o1, o2, o3 and o4. |
| Type |
The values in the table are presented as fixed values with two decimals (Fixed Table). You may choose to have the values in the table represented as floating points instead (Float Table) in which case the values would be represented as, for example, 7.00000e+000. |
| Decimal point | Enter the number of decimals in the box. The number of decimals is really a scaling (division by 10, 100, 1000, etc.) that the system automatically performs. |
| Minimum value | Enter a minimum value for the object. By default, IGSS uses the lowest value in the Value column. |
| Maximum value | Enter a maximum value for the object. By default, IGSS uses the highest value in the Value column. |
Beside the type-specific properties a number of properties which are common to all object types are available from the other tabs of the Object Properties form.
If the indexes of the table are very similar, for example using the same unit designation or number of decimals, you can select the Shared Properties radio button on the Table tab, to apply the same Units, Decimals, Minimum and Maximum properties to all the table indexes .
If you the indexes are significantly different, or if you need to present the values with different unit designations and/or number of decimals, you can select the Individual Properties radio button and then define individual properties for the relevant tables indexes.
If you use the Property Table View form to edit the Table object, the Shared Properties/Individual Properties settings are toggled in the Individual Properties column in the Property Table View form, left pane > Objects > Standard > Tables.
A table object can be represented in multiple ways on a process diagram, using Bar displays or rectangles or using the built-in symbols in IGSS
Table objects cannot be used as Master Objects in a Faceplate Master diagram.
A table object has no alarm limits and therefore cannot trigger alarms. To enable alarms on table objects, you can create a connection between a table object and an analog object with defined alarm limits and alarm texts. The table object will inherit the alarm limits of the analog object it is connected to.
The measuring ranges of the table object indexes (minimum and maximum values) must be identical with the alarm limits of the analog object the table object is connected to.
If the measuring ranges are not identical with the alarm limits of the analog object, incorrect alarms for the table object might be triggered as the alarm limits of the analog object are applied to all the table object indexes, even those containing different measuring ranges.
Although a table object can handle up to ten process values, only one address is given on the Atom Mapping tab. This is because the system assumes that the values have consecutive PLC addresses.
If you have a number of very similar table objects sharing multiple properties, you will find it useful to use a table object template. You will thus eliminate the need of entering the same information for many objects and obtain a better consistency in your configuration.
By using the special scaling object, you can convert I/O values simply by connecting it to the table object whose values you want to convert.
A typical example is to convert °C to °F. The corresponding scaling object is defined once and can then be reused as many times as needed for both analog and table objects.
To obtain more advanced functionality, you can connect a table object to another object type.
See Also
The table object properties form
Graphical display of table objects
To define a standard table object
To define a table object as a bar display
To define a table object as a moving symbol
Connecting objects to each other
Scaling analog or table objects
Analog, table and counter object templates