Troubleshooting - Device Connectivity Status
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 |
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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 to learn more.
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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 Belden Horizon Data Operations. | 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. | |
Incorrect Tag Information To prevent the PLC from going into fail-safe mode or from crashing the process when a tag has incorrect information, Belden Horizon Data Operations disconnects communication with the PLC. For example, a tag may contain an incorrect address. |
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