Automatic Allocation; Manual Allocation - Omron CJ2 CPU - REV 10-2010 User Manual

Cj2 cpu unit software

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4 CPU Unit Initialization

4-3-2 Automatic Allocation

With automatic allocation, I/O tables are not created by the user. Every time the power supply is turned

ON, I/O memory will be allocated to each Unit based on the locations of the Units. The allocated mem-

ory is used for data exchange with the Units.

There are no registered I/O tables, and the system will not check the Unit configuration.

CJ2H-CPU68-EIP

00 0000 CJ1W-ID201

01 2000 CJ1W-AD041-V1

02 1500 CJ1W-CLK21-V1

(slot number)

area address

With manual allocation, the user creates I/O tables called registered I/O tables.

You can create I/O tables by using one of the following methods with the CX-Programmer.

• Creating I/O Tables Based on the Actual Unit Configuration

With this method, I/O tables are automatically created based on the configuration of actually mounted

Units with the CX-Programmer connected online.

• Editing I/O Tables Manually and Transferring Them to the CPU Unit

With this method, the I/O tables are manually created offline by registering each Unit in the desired

location using the CX-Programmer, and the completed I/O tables are transferred to the CPU Unit.

Whichever method is used, an I/O Setting Error will occur (A401.10 will turn ON) and operation will not

start if the configuration of connected Units is different from the unit configuration in the I/O tables when

the PLC is turned ON.

For details on I/O allocation methods, refer to 8-1 I/O Allocations. For details on creating I/O tables,

refer to 8-2 Setting CPU Bus Units and Special I/O Units.

CJ1W-CLK21-V1

CPU Bus Unit

CJ1W-AD041-V1

Special I/O Unit

Basic I/O Unit

CJ2 CPU Unit Software User's Manual

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