Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 259)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
11-11
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Wire Digital Input Board Status Variables
1) Select the required row from the list shown.
2) Select the W button to connect the status parameter to the required variables.
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Input Data is Valid - this status variable is used to report that the input data
is refreshed within the Refresh Timeout value.
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Refreshed by Subnet 1 to 8 - Each of these variables can be used to indicate
that the data has been refreshed by subnet 1 - 8 within the Refresh Timeout
value. This status should be used to detect latent faults within a redundant
network. The data is delivered over all available subnets simultaneously. If any
variable goes FALSE for a programmed subnet, then the data has failed to
arrive on that subnet within the Refresh Timeout value. The variables for
programmed subnets may be combined through an AND gate to provide an
indication of full redundancy on that particular data path.
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Hold Last Valid Value - When this variable is set to FALSE it will force data
to the fail safe state when data is invalid. When it is TRUE it will allow previous
data to persist when data is invalid.
3) If you need to disconnect a variable select the U button.