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Using FINS Message Communications Section 6-3
3. In all cases other than the following two exceptions, a local network table
must be made, and the DeviceNet Unit must be registered in it.
a) When there is only one DeviceNet Unit.
b) When only multiple DeviceNet Units are mounted, with no remote I/O
communications.
4. A local network table is sometimes necessary even when the DeviceNet
Unit is not operating across networks.
5. If you prepare a local network table inside the CPU Unit, be sure to register
the DeviceNet Unit.
6. Even if a local network table exists inside the CPU Unit, the 7-segment dis-
play of the DeviceNet Unit may indicate “HC” and FINS message/explicit
message communications may not be possible unless the DeviceNet Unit
is registered in the local network table.
Routing Tables
The routing tables register the communications path from a Communications
Unit on the local PC, such as a DeviceNet Unit, Controller Link Unit, SYSMAC
LINK Unit, or Ethernet Unit, to the network to which the remote PC is con-
nected. The routing tables are made up of two tables, the local network table
and the relay network table, as described below.
Local Network Tables The local network table lists the unit numbers of the Communications Units
mounted to the PC and the addresses of the Networks to which each Unit
belongs. If multiple Communications Units are mounted to one PC CPU Unit,
the local network table is used to distinguish between network addresses.
The following type of table is used to show which Communications Unit data
must be sent through to reach a destination network address, when sending
data to a network address from one PC’s CPU Unit.
Local network: The address (1 to 127) of the network to which the Communi-
cations Unit belongs.
CPU Bus Unit’s unit number: The unit number of the CPU Bus Unit.
Example
Local Network Table
Local Network Address CPU Bus Unit’s unit number
Address of local
network
CPU Bus Unit’s
unit number
100
Unit #00
Unit #01
Unit #02
Network address 1
Network address 2
Network address 3