Measurement-computing CB-COM-7013 Manual do Utilizador descarregar pdf (Página 39)

CB-7013, CB-7033 User’s Manual

3.3 Dual Watchdog Operation

Dual Watchdog = Module Watchdog + Host Watchdog

The Module Watchdog is a hardware reset circuit to

monitor the module’s operating status. While working in harsh or

noisy environment, the module may go down by the external noise

signal. The circuit may let the module to work continues and never

halt.

The Host Watchdog is a software function to monitor the

host’s operating status. Its purpose is to detect a network/communi-

cation problem or host halt. When a time-out occurs, the

module changes all outputs to the safe state to prevent

possible dangerous problems of a controlled unit/process.

The CB-7000 module with Dual W atchdog makes the

control system more reliable and stable.

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Measurement-computing CB-COM-7013 Manual do Utilizador Página 39