Dalsa Spyder3 Manual de usuario descargar pdf (Pagina 93)

Spyder3 GigE Vision SG-14 Monochrome Cameras User’s Manual 93

Teledyne DALSA 03-032-20123-01

How the Lookup Table Works

The Lookup Table has 8 inputs (I0 - I7) capable of two states each (true, false). Thus, the outputs have a

total number of 256 input combinations. The result of each combination can be 1 or 0.

When you modify the equations in the Lookup Table, the controller calculates the results of all 256 input

combinations and stores the result of each output as a 256-bit lookup table (hence the name). There are 18

outputs (Q0 - Q17), so the controller calculates 18 different lookup tables.

The controller then passes the resulting 18 lookup tables to the IP Engine. Knowing the value of the 8

inputs, the PLC needs only look up the value of the resulting output (for each output), rather than

calculate it. Thus, the Lookup Table can achieve a propagation delay of only one system clock cycle (30

ns), regardless of the complexity or number of Boolean expressions.

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Dalsa Spyder3 Manual de usuario Pagina 93