Allocated Cio Area Words - Omron CS1W-PRM21 Operation Manual

Allocated CIO Area Words

4-2

Allocated CIO Area Words

86
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. 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.
Bit 00
Reserved
Reserved
Section 4-2
Data direction
CPU Unit to PROFIBUS Unit
CPU Unit to PROFIBUS Unit
PROFIBUS Unit to CPU Unit