3 Configuration Software
3-22
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
I/O Mapping Areas
Each Output/Input Allocation tab also contains two areas on to which the I/O data can be mapped.
The areas will in turn be mapped to the CPU memory. By default all data is mapped to Area 1, in
order of ascending slave device address.
Note 1 When mapping, the modules are copied from the module list to the mapping Area and not moved. This
means that the module list acts as a resource for the two Mapping Areas, below the module list.
2 When adding/removing slaves/modules, and Auto Addressing has been enabled, the modules in the
Areas will be remapped. This usually results in I/O data being re-mapped. Therefore it is recommended to
select all slaves and modules, before setting up the CPU memory mapping configuration.
Precautions for Correct UsePrecautions for Correct Use
The default mapping of areas on to the CPU memory is the same default mapping as used in the
CJ1W-DRM21 Devicenet Master/Slave Unit. Care should be taken to avoid data overlap, if such
a Unit is part of the same CPU system as the CJ1W-PRM21 PROFIBUS Master Unit.
Mapping Area Controls
Each mapping Area in the Allocation tab is equipped with four controls and an information field
located below the area. The controls and information field are listed and explained in the table
below.
Column Description
#Addr. Station address on the network, obtained from the slave DTM.
Index Index number of the I/O module.
Device Device name, obtained from DTM.
Module System generated name.
Size Module data size, unit of type mentioned in next column.
Type Module data type, e.g. Byte, Word etc.
Addr Mapped address area in CPU memory. For example: CIO3200, equals CIO
Area, start address 3200.
Column Description
Area Selects the CPU memory area to which the associated
I/O Area will be mapped. Possible options are:
• Not Used (List must be empty).
• CIO
• DM
• Work
• HR
• EM Bank 0 to 12 (Decimal)
Start Address In this field the user can enter the start address in the CPU memory of the
mapped data block.
Length The length box allows you to select the number of visible rows. The mini-
mum and the default value is 100 words. If more than 100 words are config-
ured, the minimum Length value will be that number.
The user can set the Length value to up to 7168 words.
Occupied This field display the actual length of the data block (not necessarily the
same as the amount of data in it). This length includes both data and any
gaps between modules. Gaps may only be there if Auto-Addressing option
in the Master Setup tab is disabled (See also Note 1).
Compress button Pressing the Compress button will compress the Area list associated with it,
i.e. this action will remove all gaps from the mapping list by moving all
mapped I/O modules as close to the start of the memory area as possible.
(See Notes 2 and 3).
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