Datasheet

178 Programmable Controllers

I/O Allocations

In CJ-series PLCs, part of the I/O memory is allocated to each Unit. Units are divided into the following 3 groups for allocations.

•Basic I/O Units

•Special I/O Units

•CPU Bus Units

Basic I/O Units

Special I/O Units

CJ1 CPU Bus Units

Basic I/O Units

Allocations

CIO Area:

CIO 0000 to CIO 0079 (See note.)

(Memory is allocated in word units based on mounting position in the Racks.)

Note: The Rack's first word setting can be changed from the default setting

(CIO 0000) to any word from CIO 0000 to CIO 9999. The first word set-

ting can be changed only with a Programming Device other than a Pro-

gramming Console.

Special I/O Units

Allocations

Special I/O Unit Area:

CIO 2000 to CIO 2959 (See note.)

(Each Unit is allocated ten words based on its unit number.)

Note: A maximum of 40 Units can actually be mounted to a PLC because that is

the maximum number of slots possible.

CJ1 CPU Bus Units

Allocations

CPU Bus Unit Area:

CIO 1500 to CIO 1899

(Each Unit is allocated 25 words based on its unit number.)

Y201-EN2-03.book Seite 178 Donnerstag, 30. März 2006 1:52 13