ICP DAS USA I-7521 User Manual page 104

I-752N Series Module Status Comparison:
(1)
Module hardware watchdog reset

All DO values return to their initial start values

No change in module status

Accepts a host DO command to change the DO state
(2)
Host software watchdog failure

All DO values return to their initial save values
 Module status=04  host watchdog failure

Ignores all host DO commands until the module status is cleared to 0 using the ~AA1
command
I-7521/I-7522/I-7522A/I-7523/I-7524/I-7527 User's Manual,Ver2.5 Aug.2015
104