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8 I/O Allocations and Unit Settings
CJ2 CPU Unit Software User’s Manual
8-1 I/O Allocations
8
8-1-3 Manual Allocation
z I/O Allocation Procedure
Create the I/O tables using the CX-Programmer, and then transfer them to the PLC. Create the I/O
tables offline and then transfer them to the PLC online.
1 Double-click IO Table in the project tree in the main window. The I/O Table Window will be dis-
played.
2 Double-click the Rack to be edited. The slots for the selected Rack will be displayed.
3 Right-click the slot to which a Unit is to be assigned and select the Unit from the pull-down menu.
4 After editing the I/O tables, transfer them to the CPU Unit by selecting Options - Transfer to
PLC.
z Allocating First Words to Rack Positions and Reserving Unused Words
You can use the CX-Programmer to set the first word for a Unit at any position in any Rack. Thereaf-
ter, consecutive words after the specified first word will be allocated to the next Unit in the order the
Units are connected. It is possible to make up to 63 groups by setting the first word for the first Unit
in each group.
Allocation Method
When setting the first words for Rack positions (called “slots”), the first word must be set for slot 00
on the CPU Rack. The first word can then be set for any slot on any Rack for up to 63 other slots.
• Each first word set for a slot creates a group starting with that slot.
• Words are allocated starting from the specified word to the first Unit in the group and continuing
left to right allocating consecutive words to each Unit until the next group (i.e., until the next Unit
for which a first slot word is set). The next group can start on the same Rack or on a following
Rack.
• For group 00, the first word is set for slot 00 of the CPU Rack. For groups 01 to 63, you can set the
first word for any slot on any Rack.
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