
3–12 Addressing Modes for Your Remote I/O
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• When using double-slot block-transfer modules:
• The left slot of the complementary I/O group must be empty.
• You can only place an 8-point output module (if any) in the
right slot of the complementary I/O group.
• When using single-slot block-transfer modules:
• The right slot of the primary I/O group can be another
single-slot block-transfer module, or an 8-point input or output
module.
• The left slot of the complementary I/O group must be empty.
• You can place an 8-point output module in the right slot of the
complementary I/O group; this slot must be empty if the
corresponding slot in the primary I/O group is a single-slot
block-transfer module.
When you select 2-slot addressing, each pair of slots (one I/O group)
is assigned to the corresponding pair of words in the input and
output image tables. You assign one I/O rack number to eight I/O
groups (Figure 3.10).
Figure 3.10
I/O Image Table and Corresponding Hardware for One
Assigned Rack Number with 2Ćslot Addressing
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