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5 Operation
5-14
CJ-series PROFINET IO Controller Unit Operation Manual for NJ-series CPU Unit (W511)
2
Allocate each Input/Output area to CPU memory.
Default I/O Mapping Algorithm
When setting up the network, i.e. selecting the slave devices and I/O modules per slave, all input
modules will be allocated to Input area 1 and all output modules will be allocated to Output area 1
(by default). The following rules apply when allocating the I/O modules to the areas:
•
I/O modules are mapped starting at the lowest address of an Input/Output area.
•
I/O modules are mapped in ascending order according to IO Device No.
•
I/O modules per slave device are mapped in the order in which they were selected, when con-
figuring the slave device.
Furthermore, Input area 1 is by default mapped to CIO 3300, whereas Output area 1 is by default
mapped to CIO 3200.
Example
The default mapping algorithm is illustrated in the figure below, with the following configuration:
•
Slave device 1: One input/output module, one output modules.
•
Slave device 2: One input module.
•
Slave device 3: One output module.
•
Slave device 4: Two input modules.
The CJ1W-PNT21 PROFINET IO Controller Unit, will assemble the correct PROFINET data mes-
sages from the storage order in the Input and Output memory areas.
Additional Information
•
The end address of each Input/Output area in the CPU memory depends on the size of the
allocated I/O data.
•
If more than 100 words of input or output have been configured for the slave, overlap of mem-
ory areas will occur in the CPU (if default I/O mapping is used as shown above).