4 Remote I/O Master Communications
4-28
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
3 The start bit for node addresses must always be bit 00, and never bit 08.
4 Multiple masters cannot share the same slave.
5 Be sure to use user-set allocations and operate the Master Unit with the scan list enabled if
multiple masters are connected to a single network. Communications will not be possible if
there is more than one master with the scan list disabled connected to a network.
Step 6: Define the User-defined Variable
Define a user-defined variable that specifies the AT specification for the area to which each slave is
allocated. By using the user-defined variable, the user program can access the allocation area of the
slave.
In the following situations, the table must be reset, the *_Sw1MstrAlocCmd (Master User-set Alloca-
tions Switch) changed to TRUE, and the scan list recreated:
• Adding a slave
• Removing a slave
• Changing a node address
• Changing a node allocation
There is no need to clear the scan list.
Changing System Components
Example:
OUT block 1 IN block 1
Node address 01
Node address 02
Node address 03
Node address 01
Node address 02
This is not necessary.
Master
Slave
Master
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