Peer-to-Peer Digital Inputs
When configuring a digital input data block, define these properties:
Property | Description |
|---|---|
Refresh Timeout | The maximum number of milliseconds allowed between successive refreshes of the input data. When the time is exceeded, the input data is declared invalid and either retains the last received value or reverts to the fail-safe condition, depending on the Hold Last Valid Value setting. Possible values range from 1 to 10000 ms. The default value is 5000 ms. |
Value in Failed State | The control value to be adopted by the input when the input data is not refreshed within the Refresh Timeout value and therefore declared invalid. Possible values are 0 and 1. The default value is 0. |
Wire the following status variables for digital input data blocks:
Variable | Description |
|---|---|
Input Data is Valid |
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Refreshed by Subnet 1 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 2 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 3 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 4 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 5 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 6 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 7 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Refreshed by Subnet 8 | This status variable is used to detect latent faults within a redundant network. The data is simultaneously delivered over all available subnets.
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Hold Last Valid Value |
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To configure a digital input data block
- In the Communication View, double-click the digital input data block.The Communication property page displays with theData BlockandData Variablestabs.
- In theData Blocktab, enter the required values for theRefresh TimeoutandValue in Failed State.
- Click
to wire the required status variables. - (optional) To unwire a status variable, click
.
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