PACSystems VersaMax Genius Network Interface User Manual Section 3
GFK-1535D Jan 2023
Operation 49
3.3.2 Input Data Format
When the NIU takes its turn on the bus, it sends one input data message
containing the latest values for all configured discrete inputs followed by
all configured analog inputs. Because they are broadcast, they can be
obtained by any bus controller on the bus.
Figure 39: Input Data Format
The data lengths are equal to the lengths of %I and %AI data configured
in the NIU. Either length may be zero.
Discrete inputs appear in the input message in the same sequence as
their assigned input references. Each discrete input module occupies one
byte per eight circuits.
Analog inputs are also in the same sequence as their input references.
Each analog input module occupies two bytes (one word) for each analog
channel.
Input Defaults
If an input module is removed or fails to operate correctly, its configured
default state is substituted for actual input data. A diagnostic message is
provided to indicate the loss of the module. Forced input data is not
affected.
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