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The following table shows which bits can be used as I/O bits in each of the

Expansion I/O Units. Bits in the shaded areas can be used as work bits but

not as output bits. The word addresses depend on the CPU that the Expan-

sion I/O Unit is coupled to. In all cases the first Expansion I/O Unit address

for input and output words is one more than the last CPU address for input

and output words. For example, the last CPU word address for a C40K CPU

is 03 and hence the first input or output word address for any of the Expan-

sion I/O Units coupled to a C40K CPU will be 04. In the tables below “n” is

the last CPU word allocated as an input or output word.

There are several models for some of the Units listed below. A blank space

(_) in the model number indicates that any of the applicable model numbers

could be inserted here.

Word (n+1)

Word (n + 2)

Word (n + 3)

Word (n + 2)

Word (n + 3)

Word (n + 1)

Word (n + 2)

Word (n + 1)

Model Input bits Output bits Model Input bits Output bits

C20P

C16P

-Ij-j

C28P

C40P

C60P

C16P

-Oj-j

C4K-Ij

C4K-Oj

C4K-TM

Cannot

be used

Word (n+1)

Word (n + 2)

Word (n + 4)

indicates

words that cannot be used for I/O,

but can be used as work bits.

Cannot

be used

Cannot

used.

Cannot

used.

I/O Bits Available in

Expansion I/O Units

Internal Relay (IR) Area Section 3-3

Brand	Omron
Model	SYSMAC C40K
Category	Controller
Language	English

Omron SYSMAC C40K User Manual

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