46
CJ1-H/CJ1M CPU Unit Ver. 2.0 Upgrades Section 1-6
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.
When using communications for to 4 to 8 network levels, use only CS/CJ-
series CPU Units Ver. 2.0 or later. Other CPU Units cannot be used. Rout-
ing errors (error codes 0501 to 0504 hex) may occur in the relaying PLCs,
preventing a FINS response from being returned.
2. With CS/CJ-series CPU Units with unit version 2.0 or later, the Gateway
Counter (GCT: Number of allowed bridge passes) for FINS command/re-
sponse frames is the value decremented from 07 hex (variable). (In earlier
versions, the value was decremented from 02 hex.) With unit version 3.0
or later, the default GCT for FINS command/response frames is the value
decremented from 02 hex. CX-Net can be used to select 07 hex as the val-
ue from which to decrement.
3. Do not use the Gateway Counter (GCT: Number of allowed bridge passes)
enclosed in the FINS header of the FINS command/response frame in ver-
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
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