VTI Instruments EX1000A User Manual page 84

VTI Instruments Corp.
DIO limit events are programmable on a per channel basis; that is, each of the 8 DIO channels can
be configured with a unique set of operational characteristics. Only one DIO channel's limit event
controls is displayed at a time on the page. Navigation between the DIO channels is provided by the
DIO Channel control, a pull-down selection.
The linkage of a DIO channel to a specific limit condition on a specific input channel is done by
checking the appropriate checkbox. Multiple selections are allowed and are logically OR'ed
together. For example, Figure 5-5 shows that DIO channel 0 is linked to limit conditions on input
channels 0, 3, and 5. Specifically, DIO channel 0 will transition if any of the four specified limits is
exceeded.
To ease data entry in complex configurations, the All and None links can be used to enable or disable
a limit set value across all input channels. It should be noted that the use of these links does not
eliminate the need to click the Apply button to accept the changes.
The DIO limit events and the scan list configuration controls are autonomous. That is, specifying a
limit condition in DIO Limit Events does not automatically enable it in the scan list. Similarly,
removing an input channel from the scan list does not automatically remove it as a linked limit
condition. DIO limit event linkages to unscanned channels do not cause an error condition and are
simply ignored in the evaluation.
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