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
