Omron SYSMAC C500-NC113 Operation Manual page 11

Data Communications
Between PCU and PC
All data and command communications between the Programmable Controller
and Position Control Unit use the Intelligent I/O Read and Write instructions.
Because the C500-NC113/211 utilizes Intelligent I/O Read and Write instruc-
tions, it cannot be operated in situations where these instructions cannot be
used. For example, it cannot be operated with a Remote I/O Slave Unit or with a
CPU Unit that does not support these instructions.
Section 1-1