Choose and name channels#
Each element of the block’s input becomes one channel in the dataset, named from the block’s channel list.
The block has one input, a vector of doubles. The first element is written to the first name in
Channel names (comma-separated), the second element to the second name, and so on, so the
input’s width has to equal the number of names. To record several signals, wire them into a
Mux or a Bus Creator, and that into the block. Signals of other types, such as single,
integers or Booleans, need a Data Type Conversion block set to double. Without one, the
model fails to compile with a data type mismatch.
Detect the names from the model#
Wire the signals up first, then click Detect from connected signal in the block’s dialog. The button reads names from the diagram and fills in the channel list, which keeps the names and the input in the same order. Where the names come from depends on what is wired into the block:
Wired into the block |
Channel names come from |
|---|---|
Mux |
Each input line’s name, or the name of the block the line comes from if the line has no name. An input fed by a Bus Creator, Bus Selector or another Mux gives the names the other rows describe. An input with nothing connected is named by position: |
Bus Creator |
The bus element names. |
Bus Selector |
With Output as virtual bus on, every selected signal. With it off, the signal on the output port wired to the block. |
Any other block |
The line’s name, or the name of the block it comes from. |
Naming the lines gives the clearest channel names. Without line names, block names such as
Band-Limited White Noise become channel names as they are, spaces included.
When two signals have the same name, the second gets _2 added, the third _3, and so on,
skipping any name another signal already has, so each signal gets its own channel. Rename them
in the model and detect again if you want other names.
Vector signals#
Detect from connected signal doesn’t compile the model, so it can’t see how wide a signal is. A vector signal of width 3 that carries one name gives one channel name, and Simulink then reports a port width mismatch when the model runs. Split the vector into named lines going into a Mux, or type the three names into the channel list yourself.
Type the names#
The channel list is a MATLAB expression, so keep the quotes when you edit it:
'<name 1>, <name 2>, <name 3>'
Changing the number of names changes the width of the block’s input. Spaces around each name are ignored.