Rockwell-automation 1771-ASB/E Remote I/O Adapter User Manual Manual de usuario descargar pdf (Pagina 33)

3–3Addressing Modes for Your Remote I/O

!    !" 

Definition: The processor addresses two I/O module slots as one I/O

group.

Concept: Each physical 2-slot I/O group is represented by a word in

the input image table and a word in the output image table. Each

input terminal corresponds to a bit in the input image table word and

each output terminal corresponds to a bit in the output image table

word.

The maximum number of bits available for one 2-slot I/O group is

32: 16 bits in the input image table and 16 bits in the output image

table. The type of module you install (either 8 or 16-point I/O)

determines the number of bits in the words that are used.

You select 2-slot addressing by setting switches 5 and 6 of the I/O

chassis backplane switch assembly to the OFF position.

I/O Module Combinations

The combination of I/O modules you can use depends on the

addressing method and I/O chassis you select.

Table 3.A lists acceptable I/O module combinations with 2-slot

addressing.

Table 3.A

I/O Module Combinations With 2Ćslot Addressing

I/O Chassis

Series

I/O Module Combinations Per I/O Group

Data Table Bits Used

Input Image Table Output Image Table

   # ! !  

 # ! ! !  

 # !  ! ! !  

 # !     ! ! !  

     # ! ! !  

   !  

    "  # !  ! ! !  

 #   # ! ! !  

 # !   # ! ! !  

2ĆSlot Addressing

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 93 94

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Rockwell-automation 1771-ASB/E Remote I/O Adapter User Manual Manual de usuario Pagina 33