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Chapter 4 Digital I/O Functionality
© National Instruments Corporation 4-9 NI CVS-1450 Series User Manual
An example of using general-purpose outputs is driving a relay that turns
on an Inspection in Progress light for an operator to see while the inspection
sequence is running.
I/O for Fault Conditions
The CVS-1450 device recognizes the following fault conditions:
• External shutdown, when Shutdown mode is enabled
• Watchdog timer expiration
• Overheat
The behavior of the CVS-1450 device in the event of a fault condition is
dependent on configuration settings of the SAFE MODE DIP switch and
the software-enabled Shutdown mode. Table 4-4 summarizes how user
configuration affects the behavior of the CVS-1450 device in the event of a
fault condition. To resume operation, address the fault condition and reset
the CVS-1450 device. The following sections describe each fault condition.
Table 4-4. Configuration Settings and Effects
Fault
Condition
Configuration Settings Configuration Effects
Safe Mode
DIP
Shutdown
Enabled
Processing Halts
Outputs Change to
User-Defined States
External
Shutdown
On N/A N/A No
Off On Yes Yes
Off Off No No
Watchdog On N/A N/A No
Off On Yes Yes
Off Off Yes No
Overheat On N/A Yes No
Off On Yes Yes
Off Off Yes No