7188XA/B/C & 7521/2/2A/3/4/7 Series Hardware User’ s Manual, Ver. 3.0 Sep/2002, 7Mh-001-20 -----
85
3.5 I/O Expansion of PLC applications
There is a Man Machine Interface in most PLCs. This interface is
originally designed for MMI applications. The 7188X/7521 can use this
interface to build a bridge between PLC & 7000 modules.
The 7188X/7521 can directly read/write the internal memory of the PLC.
Therefore the
PLC can access the 7000 input modules
as follows:
1. The 7188X/7521 sends commands to the 7000 input modules
2. The 7188X/7521 writes this data to the PLC’ s internal memory
3. The PLC accesses this data from the internal memory
The
PLC can control the 7000 output modules
as follows:
1. The PLC writes data to its internal memory
2. The 7188X/7521 reads this output data from the PLC’ s memory
3. The 7188X/7521 sends commands to the 7000 output modules
In this way, the input data of the 7000 modules can be shown on the
touch screen. Also, the user can control the output of the 7000 modules from
the touch screen.
PLC
7188X/7521
7000 series
COM2:RS-485
COM1:RS-232
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