Retained- By default, UniStream tags are not retained. This means that during power-up, their status will return to zero. Checking “retained” option in the Tag Editor window will change this tag to retain its value at power-up.
Power-Up Values- This option is only available on tags that are not retained. A value is loaded to a tag on power-up of the controller.
Initial Value-This option is only available for retained tags. Option will ONLY be used by the tag upon FIRST DOWNLOAD. After this, the tag retains its last value, even if the same application is re-downloaded or if the unit reboots. The only way to obtain the “initial value” again, another project must be downloaded first, then re-download the intended application.