ICP DAS USA I-7188XA, User Manual

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I-7188XA Series User’s Manual ( Ver1.2, Feb/2014, 7MH-019-10 ) ---
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5.4 PLC I/O Expansion Application
Most PLCs contain a Man Machine Interface that was originally
designed for MMI applications. The I-7188XA(D) can use this interface
to construct a bridge between a PLC and the 7000 series modules.
The I-7188XA(D) can directly read/write from/to the internal memory of
the PLC, meaning that the PLC can access the 7000 series input
modules as follows:

The I-7188XA(D) sends a command to the 7000 series input
modules

The I-7188XA(D) writes this data to the internal memory of the
PLC

The PLC accesses this data from its internal memory
The PLC can control the 7000 series output modules as follows:

The PLC writes data to its internal memory

The I-7188XA(D) reads the output data from the memory of the
PLC

The I-7188XA(D) sends a command to its 7000 output modules
PLC
I-7188XA(D)
7000 series modules
COM1: RS-232
COM2: RS-485