Considerations for Communication Loss Diagnostics
The response time and diagnostic information for a loss of communication depends on the device and configuration settings.
Type of Connection | Device Behavior |
|---|---|
Direct connection to a controller | The device reports communication loss. The device communication loss can be replaced by the diagnostics of a communication adapter. |
No connection to a controller | Communication adapters that do not have a connection to the controller do not report communication loss diagnostics. We recommend that you configure your communications adapters for a status connection to make sure that they report any communication loss diagnostic in a timely manner. |
Data connection | The device reports communication loss. The device communication loss can be replaced by the diagnostics of a communication adapter. |
Rack-optimized connection | The device does not report communication loss diagnostics. The communication adapter reports communication loss diagnostics. A device with a rack-optimized connection has a reduced set of diagnostics as compared to a direct connection. |
When enabled, the Automatic Diagnostics feature enables the following:
- Communication loss diagnostics for all devices in the controller I/O configuration.
- Device-level automatic diagnostics evaluations for all uninhibited and enabled devices.
You can disable Automatic Diagnostics for a specific device in the device configuration. The communication loss diagnostic remains active even if the device disables Automatic Diagnostics. To disable communication loss diagnostic, inhibit the device or disable Automatic Diagnostics at the controller.
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