Setting Allocated Dm Area Words For Special I/O Units And Cpu Bus Units; Setting Procedure - Omron CJ2 CPU UNIT SOFTWARE User Manual

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4-5
Setting Allocated DM Area Words for
Special I/O Units and CPU Bus Units
These settings must be made if Special I/O Units or CPU Bus Units are used. Set the DM Area words
allocated to Special I/O Units and CPU Bus Units using the CX-Programmer.
4-5-1 Setting Allocated DM Area Words for Special I/O Units and CPU
Bus Units
The initial settings for Special I/O Units and CPU Bus Units are made words allocated to the Unit in the
DM Area of the I/O memory in the CPU Unit. The settings in the allocated DM Area words are trans-
ferred to the Special I/O Units and CPU Bus Units from the CPU Unit when the power supply is turned
ON.
The allocated DM Area words are allocated from the following addresses
Initial Settings for Special I/O Units
One hundred words per Unit are allocated from between D20000 and D29599 according to the unit
number set on the rotary switches on the front of the Unit.
Initial Settings for CPU Bus Units
One hundred words per Unit are allocated from between D30000 to D31599 according to the unit
number set on the rotary switches on the front of the Unit.
The actual settings and transfer timing for the allocated DM words depend on the type of Special I/O
Unit and CPU Bus Unit and area. For details, refer to the operation manual for the Special I/O Unit or
CPU Bus Unit.
Additional Information
Settings for Special I/O Units and CPU Bus Units are also contained in the CPU Bus Unit Setup
Area for specific Units, such as Ethernet Units and Controller Link Units, and data and programs
are also stored in Special I/O Units and CPU Bus Units (created using the Support Software for
the specific Unit).
4-5-2

Setting Procedure

Make the settings using one of the following methods.
• Select the Units in the PLC I/O Table Window of the CX-Programmer, make the settings for the Spe-
cial I/O Units and CPU Bus Units, and then transfer the settings to the CPU Unit.
• Set the data for individual addresses in the allocated DM Area words in the PLC Memory Window of
the CX-Programmer, and then transfer the settings to the CPU Unit.
• Set the data for individual addresses in the allocated DM Area words by using MOV(021) or other
instructions in the user program.
Refer to 8-2 Setting CPU Bus Units and Special I/O Units for the procedure for allocating DM Area
words to CPU Bus Units and Special I/O Units with the CX-Programmer.
CJ2 CPU Unit Software User's Manual
4 CPU Unit Initialization
4
4-15

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