Configure hardware → Set digital input alert threshold
This configures a self-monitoring facility, whereby if large numbers of input lines change state simultaneously (which may indicate a cable fault) an alert is generated.
The dialogue box allows you to enter a number. If this number of input lines change state simultaneously (meaning within one poll interval, typically 1 ms), a message will be written to the server's event log, saying
*** ALERT: 50 input lines changed state simultaneously
This may indicate a loose cable. (Typically, if a cable to an Amplicon card works loose, the inputs are disconnected, and a disconnected input is perceived as being on. If the cable is just making contact, large numbers of inputs may appear to flash on and off together.)
If you set this number very low (e.g. 2), you are likely to get the alert message during normal operation.