Allocated Cio Area Words - Omron SYSMAC CS Series Operation Manual

Allocated CIO Area Words

4-2

Allocated CIO Area Words

112
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).
CIO WORDS
Word Bit 15
n Software switches 1
n+1
n+2 Global-Control command
n+3
n+4 Unit status word
n+5 Master status word 1
n+6 Master status word 2
n+7 Slave status word
n+8 Actual bus cycle time
n+9
n+10
n+11
n+12
Slave Data-Exchange Active flags
n+13
n+14
n+15
n+16
n+17
n+18
n+19
n+20
Slave New-Diagnostics flags
n+21
n+22
n+23
n+24
The CIO Words contain two Reserved Words:
• CIO Word n+1 is reserved for future extension of switch functions.
• 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 Unit will
ignore the bits in these words, and consequently not change them, i.e. the
Unit will not set the bits to OFF. The other CIO Words are explained in the fol-
lowing sections.
Bit 00
Reserved
Reserved
Section 4-2
Data direction
CPU Unit to PROFIBUS Unit
CPU Unit to PROFIBUS Unit
PROFIBUS Unit to CPU Unit