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9-6
NX Unit IO Allocation
The detail input and output allocation is determined in the Sysmac Studio software. Use the following
information to assign input and output data in the third party IO Controller.
9-6-1
Basic IO Mapping
The numbers used to identify NX Units in an IO Device Terminal are called Unit Numbers. These num-
bers are allocated automatically from left to right starting with 1 when the power is turned ON. It is not
necessary for the user to set these numbers. The PROFINET Coupler Unit will have a unit number of 0.
PROFINET
Coupler Unit
The type and order in which NX Units are mounted will determine the IO allocation and will also affect
the Network Variable address assignments in the PLC. The figure below shows this mapping.
NX I/O data is mapped in the order in which
the NX Units are connected, from low to high.
NX Units with bit allocation are mapped from
the rightmost to leftmost bit, in 2-bit units.
NX Units with word allocations are mapped
from the low to high word address
Additional Information
NX-series PROFINET Coupler Unit User's Manual (W623)
9 Setting Up the PROFINET Coupler Unit
The NX Units' unit numbers are allocated
automatically in order, from left to right.
I/O
I/O
I/O
I/O
I/O
#1
#2
#3
#4
... ...
...
#63
I/O memory
Order of allocation
D
C
B
E
15
8
PROFINET
Coupler Unit
A
Each NX Unit's I/O data
0
D
A
B
C
E
NX Units
9
Connected order
9 - 27
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Troubleshooting
