Important:
Determine addressing in conjunction with I/O module
selection. The selection of addressing and the selection of I/O module
density are mutually dependent.
Selecting I/O Module Density
The density of an I/O module is the number of processor input or output
image table bits to which it corresponds. A bidirectional module with 8
input bits and 8 output bits has a density of 8. Table 2.B provides
guidelines for selecting I/O module density.
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