Device Connectivity Issues

at times, a device may display as disconnected the following table explains conditions that might cause a device to disconnect, the reasons it disconnected, and the steps to connect the device for this condition to connect the device free tag explicit register name required certain device drivers do not have a list of register names in the devicehub add tag form when a list of registers is not provided, the case sensitive register name must be entered exactly as it is defined in the plc the device does not display a connected status until a tag with a correct register name is created add a tag with a case sensitive register name see add tags docid\ h5heqicxrcy3nch9kbg9i to learn more hid device in wait state some hid (human interface devices), such as barcode scanners, are always disconnected and only show a connected status when they send data to manufacturing connect edge this is a temporary state and no intervention is required the device connects when there is data to receive incorrect plc configuration if configuration changes have been made to a plc, the best way to ensure accurate status is to delete and recreate the device in devicehub delete the device see manage devices docid 4fmeehfoymsfb2zbrx8x for more information create a new device with the correct plc configuration see connect a device docid\ nm1lqfefya dsiffitity and the industrial systems connection guide docid\ yq2itusjpvlgks50krq1r for more information incorrect tag information to prevent the plc from going into fail safe mode or from crashing the process when a tag has incorrect information, manufacturing connect edge disconnects communication with the plc for example, a tag may contain an incorrect address monitor all the tags in flows to identify the bad tag find the tag with a success flag set to false delete the tag from devicehub see manage tags docid\ ofncjaqkyhmqmwkrkoxqc for more information if there is no data on the flows, restart the plc if a node in a flow indicates "waiting for messages" and nothing is displayed in the debug console, this means that manufacturing connect edge has stopped communicating with the plc, so there is no data success=false message this could be caused for several reasons wrong configuration for address or data type the tag doesn't exist in the plc the plc is not able to respond in time to the poll request if there are intermittent false messages and a majority of tag messages are success=true , this could be due to the plc not being able to respond in time to the poll requests you can increase the poll interval in the devicehub tag configuration to give more time to the plc to respond to requests you can also add a filter to remove the false messages if the configuration of the tag is incorrect, the status of the devicehub device will eventually show a disconnected status to prevent the plc from going into an error state to resolve this, you can delete the incorrect tag and refresh the device if this doesn't resolve the issue, you can reboot the gateway