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Word allocation begins with the leftmost Unit on the CPU Rack, and then contin-
ues left to right on the CPU Expansion Rack or Expansion I/O Rack with the low-
est rack number set on its I/O Interface Unit. The order in which the Expansion
I/O Racks are connected is not relevant in word allocation, only the rack num-
bers. I/O words start from CIO 0000 for the first Unit on the CPU Rack and con-
tinue consecutively: CIO 0001, CIO 0002, etc.
If the lowest word assigned to a Rack in the PC Setup menu is not higher than the
total number of words required by Racks that aren’t assigned a first word, the
same word will be assigned to two Units and a duplication error will occur. A du-
plication error will also occur if words assigned to Racks overlap those assigned
to Units controlled through Remote I/O Masters in the SYSMAC BUS/2 Area,
which begins at CIO 0200. Be careful when setting areas from the SSS to avoid
overlapping allocations.
There are no specific words associated with any particular slot because different
Units can require a different number of words. Rather, each Unit is assigned the
next word(s) following the word(s) assigned to the previous Unit. If there are any
empty slots, no words will be assigned to those slots. Words are only assigned
when a Unit is mounted; all empty slots are skipped. The numbers of I/O words
allocated to the most common types of Unit are shown below.
Unit
Words required
16-pt I/O Units
1 word
24- or 32-pt I/O Units
2 words
64-pt I/O Units
4 words
Interrupt Input Unit (See note 8.)
1 word
Dummy I/O Unit
Set to 1, 2, or 4 words
Analog I/O Units
2 or 4 words
High-speed Counter Units
CT012/CT041: 2 words
CT021: 2 or 4 words
MCR Units (See note 1.)
4 words
PID Unit (See notes 1 and 2.)
4 words
Position Control Units (See note 2.)
NC111/NC103/NC112/NC121: 4 words
NC222: 2 words
I/O Interface Unit
None
Cam Positioner
2 or 4 words
Ladder Program I/O Unit
2 words
ASCII Unit (ASC03 not applicable; use
ASC04.)
2 or 4 words
SYSMAC NET Link Unit
None (assigned CIO Link Area words)
SYSMAC LINK Unit
None (assigned CIO Link Area words)
Controller Link Unit
None (assigned CIO Link Area words)
SYSMAC BUS/2 Remote I/O Master Unit
None (See note 1.)
CompoBus/D Master Unit
None
BASIC Unit
None
Personal Computer Unit
None (See note 3.)
Motion Control Units
None
Temperature Control Data Link Unit
None
Ethernet Unit
None
Remote I/O Master Unit
None (See note 4.)
Remote I/O Slave Unit
None (See note 4.)
I/O Link Unit
1 or 2 words (See note 5.)
I/O Control Unit
None
CIO (Core I/O) Area
Section 3-3
Summary of Contents for CVM1D
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