Checking for Good Quality incomingValue in a Script [ErgoTech Systems, Inc. TechWiki]

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===Checking for Good Quality incomingValue in a Script===

Scripts on server Device tags will be triggered when the tag value changes in the server. The value of the incomingValue will not necessarily be good if this occurs during the initialization of the software. So sometimes its a good idea to check for the quality of the data before running the script.

Your script can start out with getting the quality of the incomingValue:

<code javascript>
quality=incomingValue.getQuality();
</code>

"quality" will be a value from 0 up to 9999. See [[valueobject_qualities| ValueObject Qualities]] for a list of possible quality values. Generally you will want to check for the quality set to "0", Good Quality.

Use an "if" statement with the quality to determine whether to run the script or not.

<code javascript>
if (quality==0) { //run the script
...
 (the script here)
...

}
</code>




See also:

[[incomingvalue and server values|Server Values vs incomingValue]]

[[Scripting for PLC Servers]]

[[MIStudio Scripting| MIStudio Scripting, read more about ValueObject properties]]