ICP DAS USA ZT-2017 User Manual page 132

7.2 Dual Watchdog Operation
Dual Watchdog = Module Watchdog + Host Watchdog
The Module Watchdog is a hardware reset circuit that monitors the operating
status of the module. While working in harsh or noisy environments, the module
may be shut down by external signals. The Watchdog llows the module to
operate continuously without disruption.
The Host Watchdog is a software function that monitors the operating status
of the host. Its purpose is to prevent problems due to network/communication
errors or host malfunctions. When a Host Watchdog timeout occurs, the module
will reset all outputs to a safe state in order to prevent any erroneous operations
of the controlled target.
ZT-2000 series devices include an internal Dual Watchdog, making the
control system more reliable and stable.
ICP DAS, ZT-2017 and ZT-2017C AI Series User Manual, Version 1.0.1
Copyright © 2012 by ICP DAS Co., Ltd. All Rights Reserved.
Page 132