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A.2 Dual Watchdog Operation
Dual Watchdog = Module Wa 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 circuit allows the module to work 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 time out occurs, the module will reset all
outputs to a safe state in order to prevent any erroneous
operations of the controlled target.
The DGW-521 includes an internal Dual Watchdog, making the
control system more reliable and stable.
DGW-521 User Manual, Rev. A1.0
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