The following table provides Update Intervals for the B873-012 and B875-012 Modules.
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Update Interval:*
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B873-
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4 Channels
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400 ms
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B875-
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8 Channels
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710 ms
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Out of Range
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220 ms per channel
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All registers are updated every 400 or 710 ms, as long as the inputs on all of the channels are within the valid range. 220 ms is added to the update interval for each channel either under or over range.
On an eight channel module, 2 channels are under range. All the registers assigned to the module will be updated every 1150 ms, until the inputs on the out of range channels return to the valid range. When they do, the update interval will return to 710 ms.
Update Interval =
(400 or 710) + (Out of Range Channels X 220)
Using the example above:
(710) + (2 X 220) = 1150 ms
If one channel returned to the valid range, the update interval would reduce to 930 ms.
NOTE: As long as the channel is out of range, the register assigned to it will either have data of 0000 (4095 Elevated), under range, or 4096 (8192 Elevated), over range. (Refer to
Data Value Reference Chart)
* The Update Interval is the amount of time necessary to update the data for all the registers assigned to the module.
NOTE: Any module run-time diagnostic failure will result in a 0000 value being returned to the controller, regardless of selected range.
