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8 Using Expansion Units and Expansion I/O Units
CP1E CPU Unit Hardware User’s Manual(W479)
8
-5
CompoBu
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/S
I/
O Lin
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Uni
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8
8-5-4
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I/O Words Allocation
I/O words are allocated to the CompoBus/S I/O Link Unit in the same way as to other Expansion
Units and Expansion I/O Units, i.e., the next available input and output words are allocated. As
shown below, when “m” is the last allocated input word and “n” is the last allocated output word, the
CompoBus/S I/O Link Unit is allocated “m+1” as its input word and “n+1” as its output word.
In the following example, a CompoBus/S I/O Link Unit is connected as the first Unit after the CP1E
CPU Unit.
The input word (m+1) contains the data from the Master Unit and the CompoBus/S communications
status.
Write the data to be transmitted to the Master Unit in the output word (n+1).
Precautions for Correct Use Precautions for Correct Use
The 8 bits of I/O data are not always transmitted simultaneously.
• 8 bits of data transmitted from the Master CPU Unit at the same time will not always reach the
CP1E CPU Unit.
• 8 bits of data transmitted from the CP1E CPU Unit at the same time will not always reach the
Master CPU Unit simultaneously.
When the 8 bits of input data must be read together, modify the ladder program in the CPU Unit
receiving the data. For example, read the input data twice in succession and accept the data only
when the two values match.
Word m+1
CompoBus/S I/O Link Unit
8 inputs
8 outputs
Word n+1
CP1E CPU Unit with
30 or 40 I/O Points CompoBus/S
I/O LInk Unit
Input words
Output words
CIO 0
CIO 1
CIO 100
CIO 101
CIO 2
CIO 102
Word m+1
15 00 07 08 09
CompoBus/S Communications Error Flag
0: Normal; 1: Error
CompoBus/S Communication Status Flag
0: Stopped; 1: Communicating
Data from the Master Unit
Word n+1
15 00 07
Data to be transferred to the Master Unit