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4-2
4-1 SYSMAC Word Allocations and Scan List
In a CompoBus/D Network, remote I/O and message communications can be used simultaneously.
This section describes remote I/O communications, particularly the memory words allocated in the
SYSMAC PC that correspond to the remote I/O of the Slaves.
4-1-1 Overview and Restrictions of Word Allocations
H Fixed Allocation: Without Configurator
If a Configurator is not used, default word allocations are used in the CompoBus/D Master Unit. The
remote I/O is allocated in the order of CompoBus/D node addresses and the words are divided into out-
put areas and input areas. The word allocation default settings of the Master Unit are set based on the
assumption that one node should occupy one input word and one output word. Output words will be
allocated even to Units that are used only for input.
For Units that require two input words or two output words, the node addresses to which the second
word is normally allocated cannot be set. If it is set, the word allocations will overlap.
CIO 1900
CIO 1963
CIO 2000
CIO 2063
Output
area
Input
area
CIO 1900 Node 0
CIO 1901 Node 1
CIO 1962 Node 62
CIO 1963 Node 63
CIO 2000 Node 0
CIO 2001 Node 1
CIO 2064 Node 62
CIO 2063 Node 63
IR 50
IR 81
IR 350
IR 381
Output
area
Input
area
IR 50 Node 0
IR 51 Node 1
IR 80 Node 62
IR 81 Node 63
IR 350 Node 0
IR 351 Node 1
IR 380 Node 62
IR 381 Node 63
To Slaves
From Slaves
To Slaves
From Slaves
IR 50
IR 99
IR 350
IR 399
Output
area
Input
area
IR 50 Node 0
IR 51 Node 1
IR 98 Node 62
IR 99 Node 63
IR 350 Node 0
IR 351 Node 1
IR 398 Node 62
IR 399 Node 63
To Slaves
From Slaves
CV-series PCs
C200HX/HG/HE PCs
C200HS PCs
Each node address is allocated one input and one output word starting from node 00. If a Slave requires
more than one input or one output word, then it is assigned more than one node address. If a Slave
requires less than one word, it simply uses the rightmost bits in the word allocated to it.
H Free Allocation: With Configurator
A Configurator can be used to allocate words in the CompoBus/D Master Unit in any order by calling
parameters of the Master Unit and changing the word allocation of parameters. The following alloca-
tions are possible when using a Configurator.
• Output words do not need to be allocated to Input Units, only input words.
CompoBus/D System Startup Chapter 4