E X - A2 X
I / O E x p a n s i o n M o d u l e Ad a p t e r , I s o l a t e d
1 2 / 0 9
Notes:
1.
Example: 2 I/O-DI8-TO8 units consume a maximum of 140mA of the 5VDC supplied by the EX-A2X.
Addressing I/Os on Expansion Modules
Inputs and outputs located on I/O expansion modules that are connected to an OPLC are assigned
addresses that comprise a letter and a number. The letter indicates whether the I/O is an input (I) or an
output (O). The number indicates the I/Os location in the system. This number relates to both the position
of the expansion module in the system, and to the position of the I/O on that module.
Expansion modules are numbered from 0-7 as shown in the figure below.
0
1
2
3
4
5
6
7
Expansion module
identification number
Adapter
The formula below is used to assign addresses for I/O modules used in conjunction with the OPLC.
X is the number representing a specific modules location (0-7). Y is the number of the input or output on
that specific module (0-15).
The number that represents the I/Os location is equal to:
32 + x 16 + y
Examples
Input #3, located on expansion module #2 in the system, will be addressed as I 67,
67 = 32 + 2 16 + 3
Output #4, located on expansion module #3 in the system, will be addressed as O 84,
84 = 32 + 3 16 + 4.
EX90-DI8-RO8 is a stand-alone I/O module. Even if it is the only module in the configuration, the EX90-DI8-
RO8 is always assigned the number 7.
Its I/Os are addressed accordingly.
Example
Input #5, located on an EX90-DI8-RO8 connected to an OPLC will be addressed
as I 149, 149 = 32 + 7 16 + 5
Unitronics_EX-A2X_IO_Expansion_en_0511.pdf
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