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Network Instructions Section 3-25
PLC to serial ports on other devices in a network, and communications to a
host computer connected by a Host Link.
Communications to Another Device in 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.
This example shows communications from a PLC to a personal 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.
Note Communications can span up to 8 network levels, including the local network.
(The local network is the network where the communications originate.)
In order to communicate through the network, it is necessary to register a
routing table in each PLC’s CPU Unit which indicates the route by which data
PLC to PLC
To Inner Board
To CPU Unit
To CPU
Bus Unit
PLC to computer
Through the network
Within the CPU Rack
Network 1
(local network)
Network 2
Network 3
Bridge or gatewayBridge or gateway
SEND(090),
RECV(098), or
CMND(490)
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