Poll Fuse Interrupt

Polls the fuse interrupt of the Q8 data acquisition system.

Library

qctools

Description

The Poll Fuse Interrupt block for the Q8 series of I/O cards provides a mechanism for polling the fuse interrupt of the card. It reads the Interrupt Status Register of the Q8 card. The output goes high when the fuse interrupt occurs . The fuse interrupt is caused by the fuse blowing or the voltage on the Q8 terminal board falling below 4V. The block has an option for resetting the interrupt flag after an interrupt occurs. The block polls the Interrupt Status Register each sampling instant. The Poll Interrupts series of blocks may be used in Windows regardless of the status of the Q8 Windows driver.

Block Outputs

FUSE

The output goes high when the fuse on the Q8 terminal board blows or degrades such that the +5V power on the terminal board falls below 4V. The output is edge-triggered. Note that the fuse also acts as a hard watchdog. Failure of the fuse causes all analog outputs to be zeroed and all digital lines to be pulled high.

Parameters and Dialog Box

Board Number

The board number of the I/O card. If there is only one Q8 board in your system, then the board number should be zero. The second Q8 board in your system is board number 1, etc.

Sample Time

A sample time must be specified for all discrete blocks. The default value extracts the sample time from the RTW Options dialog, under Solver/Fixed step size. A numeric value rather than 'auto' should be specified in this dialog field for this default to make sense.

Clear Flag After Polling

When this option is checked, the block clears the polled bit of the Interrupt Status Register after reading it. This option allows the flag to be repeatedly polled. The output will remain high for one sampling instant when this option is checked. Otherwise, the output stays high once it has gone high.