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5-19
5 Operation
CJ-series PROFINET IO Controller Unit Operation Manual for NJ-series CPU Unit (W511)
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Removing Gaps from the I/O Mapping
Since gaps in the I/O mapping are generally undesirable, the CJ1W-PNT21 IO Controller DTM pro-
vides a means to remove all gaps after finalizing the I/O mapping procedure. This removal is accom-
plished by compressing the I/O modules in a particular area.
Compressing the I/O Mapping
Compressing re-allocates all I/O modules in an area as close to the start of the area as possible.
Compressing an area does not change the sequence of the slave devices and/or the I/O modules. It
only removes the unused memory gaps. Compressing can be initiated for each area individually.
In order to compress an area, perform the following sequence.
1
Open the CJ1W-PNT21 IO Controller DTM - Configuration User Interface.
2
Select the
IO Device Area
sub item. The window shows two sub tabs: One for Output Allocation
and one for Input Allocation. The following points apply to each of these tabs.
3
To compress the area, press the
Compress
button at the bottom.
4
After finalizing the compress action, select the
Apply
button at the lower right corner, to save
the changes made.
Additional Information
Compressing an Input/Output area has no effect on the start address of the area.
Selecting the I/O Area Start Address
After finalizing the mapping of the I/O modules to the various I/O areas, the addresses to which the
areas will be mapped in the CPU memory need to be defined. To define the area mapping, perform
the following settings.
1
For each area, which contains I/O modules, select the CPU memory area.
2
For that area, set the address to which the first location of the Input/Output area will be mapped.
The Input/Output area will occupy the CPU memory area from this start address to ascending
memory locations.