Omron SYSMAC CVM1 Series Operation Manual page 51

CIO (Core I/O) Area
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
16-pt I/O Units
24- or 32-pt I/O Units
64-pt I/O Units
Interrupt Input Unit (See note 8.)
Dummy I/O Unit
Analog I/O Units
High-speed Counter Units
MCR Units (See note 1.)
PID Unit (See notes 1 and 2.)
Position Control Units (See note 2.)
I/O Interface Unit
Cam Positioner
Ladder Program I/O Unit
ASCII Unit (ASC03 not applicable; use
ASC04.)
SYSMAC NET Link Unit
SYSMAC LINK Unit
Controller Link Unit
SYSMAC BUS/2 Remote I/O Master Unit None (See note 1.)
CompoBus/D Master Unit
BASIC Unit
Personal Computer Unit
Motion Control Units
Temperature Control Data Link Unit
Ethernet Unit
Remote I/O Master Unit
Remote I/O Slave Unit
I/O Link Unit
I/O Control Unit
Section 3-3
Words required
1 word
2 words
4 words
1 word
Set to 1, 2, or 4 words
2 or 4 words
CT012/CT041: 2 words
CT021: 2 or 4 words
4 words
4 words
NC111/NC103/NC112/NC121: 4 words
NC222: 2 words
None
2 or 4 words
2 words
2 or 4 words
None (assigned CIO Link Area words)
None (assigned CIO Link Area words)
None (assigned CIO Link Area words)
None
None
None (See note 3.)
None
None
None
None (See note 4.)
None (See note 4.)
1 or 2 words (See note 5.)
None
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