![SWTB_logo_rgb_color_mode-wPadding-2000x961.png]](https://help.softwaretoolbox.com/hs-fs/hubfs/SWTB_General/Images/Press_Kit/SWTB_logo_rgb_color_mode-wPadding-2000x961.png?height=50&name=SWTB_logo_rgb_color_mode-wPadding-2000x961.png){kind=logo}
Monitoring PLC Communication in TOP Server
Is there a way I can detect a communications failure to a device and display it in my client application?
TOP Server has built in tags that show if the communications for each device is in error.
There are 2 tags in particular that are automatically added to each device within the TOP Server. Because each device is defined as <channel>.<device>, you will find that there is a group called "_System" that is automatically created for each device. Under this group (_System) you will find these two tags:
-
_Error
-
_NoError
Both tags are boolean. If the value of _Error = True/1, then there is a communications failure with the device. The _NoError tag is simply the opposite of _Error.