User Manual

89 Chapter 5
The Fail Safe Value (FSV) of communication WDT
If FSV checkbox is enabled, it presents the module will set the output
channel to logic high when WDT timeout. There are two application as
below. After all, click the Apply FSV button to take it effect.
a. Communication WDT
When the module hasn't received any TCP network packet from client too
long, such as SCADA or Web browser. That means if the waiting time is
greater than host idle time, the module will automatically set the safety
value to output.
b. P2P/GCL WDT
When the module hasn't received P2P/GCL network packets too long,
that means the waiting time is greater than idle time you entered, the
module will automatically send the safety value to host PC if you've
enabled this function.