Omron CJ1W-PNT21 Operation Manual page 111

Configuring the IO Controller
7-4-5 Mapping I/O Data
IO Mapping Concept
Default I/O Mapping
Algorithm
Example
The CJ1W-PNT21 IO Controller Unit provides an I/O mapping concept, based
on the I/O module selection for each slave device. Each selected I/O module
can - depending on whether it defines input and/or output data - be mapped to
one of two input and/or output areas. Each of the two input and output areas
can be mapped to any PLC memory area location, independent of each other.
The I/O mapping must be setup using the CJ1W-PNT21 IO Controller DTM, as
provided with CX-ConfiguratorFDT.
Mapping the I/O modules involves two steps:
1 Allocate each I/O module to one or more of the Input/Output areas.
2 Allocate each Input/Output area to PLC memory.
When setting up the network, i.e. selecting the slave devices and I/O modules
per slave, all input modules will - by default - be allocated to Input area 1, all
output modules will be allocated to Output area 1. 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 setting up 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.
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.
P LC C P U Unit
Output area
C IO 3200
Output area 1
C IO 3400
Output area 2
Input area
C IO 3300
Input area 1
C IO 3500
Input area 2
P R OF IB US DP Mas ter Unit
Output area
Output area 1
Output area 2
Input area
Input area 1
Input area 2
Figure 7.13: I/O Data mapping
Section 7-4
S lave 1: Module 1
S lave 1: Module 2
S lave 3: Module 1
S lave 1: Module 1
S lave 2: Module 1
S lave 4: Module 1
S lave 4: Module 2
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