ICP DAS USA I-7521 User Manual page 95

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Note:
When the module is first powered-on, the module should be read once and will find that
S=1. Then the user should read the module continually and find that S=0. If S is
changed to 1, this module has been reset by module hardware watchdog circuit at
least once. And all output is going to its start-value now. Therefore the user needs to
send an output command again to control all output values to desired states.
I-7521/I-7522/I-7522A/I-7523/I-7524/I-7527 User's Manual,Ver2.5 Aug.2015
95