National Instruments NI CVS-1450 Series User Manual

Shutdown mode is a software-enabled feature, that when activated, allows 
an external device to halt the CVS-1450 device processing operations. 
Additionally, Shutdown mode allows you to specify user-defined 
shutdown states for all fault conditions.

When Shutdown mode is enabled and the shutdown input signal, 
ISO Input 11, turns off, the CVS-1450 device registers an external 
shutdown condition. When this fault occurs, the POWER OK LED turns 
red and all system operation halts. To resume operation, you must reset the 
CVS-1450 device.

For all fault conditions, outputs operate according to user-defined 
shutdown states. Each TTL output is configurable to drive high, drive low, 
or 3-state, and each isolated output is on/off configurable. 

Shutdown mode is unavailable when the SAFE MODE DIP switch is 
turned on. 

Refer to Table 4-4 for a summary of how user configuration affects the 
shutdown condition.

To disable Shutdown mode once it is enabled, remove Shutdown mode 
from the software script and reset the CVS-1450 device. To reset the 
system, press the RESET button on the CVS-1450 device front panel for 
at least two seconds.

For prototyping when equipment is unavailable, you can wire from Viso to 

ISO Input 11 to simulate external equipment that indicates to the CVS-1450 device to 
operate normally.

The watchdog timer is a software configurable feature that can monitor 
software on the CVS-1450 device and take action if the software is 
unresponsive. The millisecond counter on the watchdog timer is 
configurable up to 65,534 ms, in 1 ms increments, before it expires.