Omron CJ - REFERENCE MANUAL 10-2009 Reference Manual page 908

3. Instructions
Network Communications Patterns
Communications with Another Device on the Network
The following example shows communications from a PLC to devices in another PLC (the CPU Unit,
CPU Bus Unit, or Inner Board). For more details, refer to the operation manual for the network
(Controller Link or Ethernet) being used.
To CPU
PLC to PLC
Bus Unit
This example shows communications from a PLC to a personal computer.
PLC to computer
Communications to a Serial Port in the Network
These examples show communications from a PLC to serial ports in devices in the network. The first
shows communications to serial ports in devices in another PLC (the CPU Unit, CPU Bus Unit, or Inner
Board) and the second shows communications to a serial port within the CPU Rack itself.
Through the network
Within the CPU Rack
For details, refer to the operation manual for each network (Controller Link or Ethernet).
Communicating with Devices on Other Networks
Communications can span up to 8 network levels, including the local network. (The local network is the
network where the communications originate.)
SEND(090),
SEND2(491),
RECV(098),
REVC2(492),
CMND(490), or
CMND2(493)
Network 1
(local network)
870
To Inner Board
To CPU Unit
Bridge or gateway Bridge or gateway
Network 2 Network 3
CS/CJ/NSJ Series Instructions Reference Manual (W474)