
Hardware Configuration
23
If there is a conflict between the current M90 hardware information and the project
configuration, you will be prompted to choose how to proceed.
If you decide to continue with the Download, the M90 OPLC will be stopped and reset during
the Download procedure.
8. Click OK. The Download process is activated.
The Hardware configuration is now updated.
Note: If your application does not require that you use all of the I/Os on a particular I/O
expansion module, do not select the unused I/Os when you configure the module. Selecting
unused I/Os may add to the M90's scan time
Addressing: I/O Expansion Modules
Inputs and outputs located on I/O expansion modules that are connected into an M90
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 expansion module’s position 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.
The formula below is used to assign addresses for I/O modules used in conjunction with
the M90 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).
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