Panasonic FP7 Series User Manual page 41

 How to count I/O numbers for units that have both inputs and outputs
In the case of a unit that has both inputs and outputs (e.g. mixed input/output units, intelligent
units), input numbers and output numbers start with the same value.
E.g. If input numbers for a mixed input/output unit are X100 to X11F, the unit's output
numbers are set at Y100 to Y11F.
 I/O numbers allocated to the CPU unit
A fixed area is allocated to the COM port and the ET-LAN port.
When the number of occupied input words is different from the number of
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occupied output words, the larger number is allocated to the unit.
For using the user connections 17 to 216 by extending the number of user
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connections with the built-in ET-LAN in the CPU unit, 26-word area (WX11 to
WX36/WY11 to WY36) is used as a flag for confirming the communication
instruction SEND/RECV. Change the starting number of the CPU unit or
another unit not to overlap I/O maps.
The starting numbers of I/O contacts of each unit including the CPU unit
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can be changed by the setting of tool software.
3.1 Basics of I/O Allocation
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