Slave Unit Allocations; Overview - Omron CJ Series Operation Manual

5 Remote I/O Communications
5-4

Slave Unit Allocations

This section describes how I/O in the CPU Unit where the CompoNet Master Unit is mounted is allo-
cated to the Slave Units.
5-4-1

Overview

Slave Unit I/O data, Connect Flags, and Communication Error Flags are assigned to I/O ports in the
CPU Unit where the CompoNet Master Unit is mounted. The number of nodes and the types of Slave
Units to which I/O ports can be allocated and the I/O ports that are allocated depend on the communi-
cations mode number. The number of I/O that is used by each Slave Unit is determined by the point
size of the Slave Unit.
From the user program, you access the Slave Units through device variables for the CJ-series Unit.
Device variables for the CJ-series Unit are given AT specifications to the I/O ports that are allocated to
Slave Unit I/O.
If the communications unit number is set to 8, you can make software settings from the CX-Integrator to
assign the I/O data, Connect Flags, and Communication Error Flags for the Slave Units to the desired
locations in the memory used for CJ-series Units. (You can also change the number of nodes with soft-
ware settings from the CX-Integrator.) If the communications mode number is set to 8, you must create
user-defined variables on the Sysmac Studio to access the I/O data of the Slave Units from the user
program. The user-defined variables are given AT specifications to the memory used for CJ-series
Units that was specified in the software settings from the CX-Integrator.
5-34 CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)