CompoBus/D System Startup | Chapter 4 | |
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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
HFixed 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.
CV-series PCs
C200HX/HG/HE PCs
CIO 1900
CIO 1963
Output area
CIO 1900 | Node 0 |
CIO 1901 | Node 1 |
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CIO 1962 | Node 62 |
CIO 1963 | Node 63 |
IR 50
To Slaves
IR 99
Output area
IR 50 IR 51
IR 98 IR 99
Node 0
Node 1
Node 62
Node 63
To Slaves
CIO 2000 Input
area
CIO 2000 | Node 0 |
CIO 2001 | Node 1 |
IR 350
From Slaves
Input area
IR 350 IR 351
Node 0
Node 1
From Slaves
CIO 2063
C200HS PCs
IR 50
| Output | |
IR 81 | area | |
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IR 350 |
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Input | ||
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| area | |
IR 381 |
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CIO 2064 | Node 62 |
CIO 2063 | Node 63 |
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IR 50 | Node 0 |
IR 51 | Node 1 |
IR 80 |
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Node 62 | |
IR 81 |
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Node 63 | |
IR 350 |
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Node 0 | |
IR 351 | Node 1 |
IR 380 |
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Node 62 | |
IR 381 | Node 63 |
IR 399 | IR 398 |
| IR 399 |
To Slaves
From Slaves
Node 62
Node 63
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.
HFree 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.
