IO-PT 400, IO-PT 4K
I / O E x p a n s i o n M o d u l e s
8
Unitronics
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/O’s 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
2
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 module’s location (0-7). Y is the number of the input or output on
that specific module (0-15).
The number that represents the I/O’s 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.
About Unitronics
Unitronics has been producing PLCs, automation software and accessory devices since 1989.
Unitronics’ OPLC controllers combine full-function PLCs and HMI operating panels into single, compact units.
These HMI + PLC devices are programmed in a single, user-friendly environment. Our clients save I/O
points, wiring, space, and programming time; elements that translate directly into cost-efficiency.
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For more information regarding Unitronics products, contact your distributor, Unitronics headquarters via
email:
, or visit the Unitronics website at
http://www.unitronics.com/
.
The information in this document reflects products at the date of printing. Unitronics reserves the right, subject to all applicable laws, at any time, at its sole discretion, and without notice,
to discontinue or change the features, designs, materials and other specifications of its products, and to either permanently or temporarily withdraw any of the forgoing from the market.
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are not permitted to use them without the prior written consent of Unitronics or such third party as may own them.
DSP-EXP-PT4XX 12/06
2
The maximum number of I/Os varies according to the types of I/O modules linked to the PLC.
