advance onboard diagnostics
i.e. for AI815:
The module performs self-diagnostic cyclically. Module diagnostics include:
•External power supply, Transmitter power and External shunt error. Error in these are reported as External channel error.
•Analog Read Back, Reference Voltage, Internal Power Supply, Checksum, Watchdog and Memory. Error in these are reported as Module Error.
For more details regarding other modules you can find in this document: