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Slave Remote I/O Communications Section 5-1
5-1 Slave Remote I/O Communications
A CS/CJ-series DeviceNet Unit can function as a Slave Unit in remote I/O
communications and a single CS/CJ-series DeviceNet Unit can function as
both a Master Unit and a Slave Unit. This section describes Slave communi-
cations.
Slave Communications
Note 1. In the following descriptions, the areas used to transfer data from the mas-
ter to the slaves are called OUT areas and the areas used to transfer data
from the slaves to the master are called the IN areas.
2. In the following descriptions, a CS/CJ-series DeviceNet Unit set to function
as a master is referred to as a “Master Unit” and a CS/CJ-series DeviceNet
Unit set to function as a slave is referred to as a “Slave Unit”.
5-1-1 Allocation Methods
All slaves are allocated words in the I/O memory of the CPU Unit to which the
Master Unit is mounted. They are allocated using one of the following meth-
ods:
1) Fixed allocations
2) User-set allocations
CS/CJ-series DeviceNet Unit (Master)
CS/CJ-series CPU Unit
IN area
OUT area
IN area
OUT area
Remote I/O communications
DeviceNet
CS/CJ-series CPU Unit
CS/CJ-series DeviceNet Unit (Slave)
Slaves