IAI America RCM-GW-DV - Manual (Page 42)

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DeviceNet Gateway
5. Overview of DeviceNet
All data exchanged between the master station and the controller are tentatively stored in the internal
memory of the Gateway Unit, and then transmitted cyclically. Accordingly, the PLC program recognizes
these data as remote DeviceNet I/Os.
Up to 16 ROBO Cylinder controllers can be connected to the Gateway Unit, with the connected controllers
assigned an axis number of 0 to 15, respectively. The Gateway Unit simultaneously sends and receives
data to/from the master station for all ROBO Cylinder controllers connected via SIO communication.
5.1 Address Assignment for the Master PLC (Omron CJ Series)
The DeviceNet unit (CPU unit) performs remote I/O communication with a slave, where data is exchanged
automatically between the CPU unit and the slave without using programs in the PLC.
Each slave is assigned appropriate areas in the I/O memory of the CPU unit in which the master unit is
installed. I/O memory areas can be assigned to slaves in one of three methods specified below:
[1] Fixed assignment
[2] Free assignment using a user setting table for free master area assignment (assignment DM)
[3] Free assignment using a configurator
The following pages provide an overview of method [1], as well as method [3] which is used more
commonly.
For details, refer to the operation manual for your PLC.