Rockwell-automation 1771-ASB/E Remote I/O Adapter User Manual Manual de usuario descargar pdf (Pagina 44)

3–14 Addressing Modes for Your Remote I/O

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Thirty-two-point I/O modules need 32 input or 32 output bits in the

processor’s image table. Because only 16 input and 16 output bits

are available for each I/O group, to address a 32-point I/O module,

the remote I/O adapter module uses the unused input or output word

associated with the adjacent I/O slot.

Refer to Figure 3.12. When the 1771-ASB remote adapter module

addresses a 1-slot I/O group containing a 32-point I/O module, the

adapter module uses the unused word assigned to the adjacent I/O

module slot. For example, the adapter module uses the unused input

word associated with I/O slot 1 (because that slot must hold an

output module and does not use its input word).

Figure 3.13 illustrates the concept of 1-slot addressing with two

32-point I/O modules.

Figure 3.12

1Ćslot I/O Group Concept With 32Ćpoint I/O Modules

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Rockwell-automation 1771-ASB/E Remote I/O Adapter User Manual Manual de usuario Pagina 44