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CJ1-H/CJ1M CPU Unit Ver. 2.0 Upgrades Section 1-5
Compatible Networks
Only the following 2 kinds of networks can be used when communicating
through a maximum of 8 networks. The network levels can be combined in
any order.
• Controller Link
•Ethernet
Note Communications are restricted to a maximum of 3 networks through
DeviceNet and SYSMAC Link networks.
Configuration of Compatible Models
All of the CPU Units must be CPU Unit Ver. 2.0 and later CS/CJ-series CPU
Units. Also, the Gateway Counter Setting must be made with the CX-Net.
Internal Structure The Gateway Counter (GCT) is in the FINS header of the FINS command/
response frame. This counter value is decremented (
−1) each time a network
level is crossed.
FINS Command Frame
Example:
Operating Procedure There is no special procedure that must be performed for CS/CJ-series CPU
Units Ver. 2.0 or later. Just set normal routing tables to enable communicating
across up to 8 network levels.
Note 1. When using communications only for up to 3 network levels, the CS/CJ-se-
ries CPU Units Ver. 2.0 or later can be used together with other CPU Units.
OR
FINS command
source
Serial
connection
This connection is not counted as a network level.
Network 1
Network 2
Level
count = 1
Level
count = 4
Level
count = 3
Level
count = 2
Network 4
Network 3
Network 8
Network 7
Level
count = 7
FINS command
destination
ICF RSV GCT
FINS header Command code Text
GCT (Gateway counter: Number of allowed bridge passages)
The standard setting is 02 hex when sending, but this value can be
user-set from 07 hex.
The count is decremented by one each time a network level is passed.
FINS command
source
FINS command
Network 1
Network 2
Network 3
FINS command
At this
oint, the
atewa
counter = 7 hex
At this point, the gateway counter = 6 hex
FINS command
FINS command
Network 4
At this
oint, the
atewa
counter = 5 hex
At this point, the gateway counter = 4 hex
FINS command
At this
oint, the
atewa
counter = 0 he
Network 8
FINS command
destination
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