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Allocated CIO Area Words
Section 4-2
4-2 Allocated CIO Area Words
For each CPU Bus Unit, the CS/CJ-series PLC allocates up to 25 words in the
CIO area. Data is stored in the offset position defined by the unit number and
shown in the following figure, starting from the first allocated word to the Unit
in the CIO Area. First word n = CIO 1500 + (25 x Unit number).
The CIO Words contain two Reserved Words:
• CIO Word n+1 is reserved for future extension of switch functions. The
Unit will always set the bits in this Word to OFF.
• CIO Word n+3 is reserved for future extension of data to be transferred to
the Unit.
These words are reserved for future use, and it is therefore not recommended
to use them for temporary data storage by a User program. The other CIO
Words are explained in the following sections.
CIO WORDS
n
n+1
n+2
n+3
n+4
n+5
n+6
n+7
n+8
n+9
n+10
n+11
n+12
n+13
n+14
n+15
n+16
n+17
n+18
n+19
n+20
n+21
n+22
n+23
n+24
Word Bit 15 Bit 00
CPU Unit to PROFIBUS Unit
PROFIBUS Unit to CPU Unit
Data direction
Global-Control command
Software switches 1
Reserved
Reserved
CPU Unit to PROFIBUS Unit
Unit status word
Master status word 1
Master status word 2
Slave status word
Actual bus cycle time
Slave Data-Exchange Active flags
Slave New-Diagnostics flags
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