Omron C200H-ASC11, Manual, Page: 79 / 301

70
Overview of Data Exchanges
Section 6-1
6-1 Overview of Data Exchanges
6-1-1 Data Exchange Methods
The ASCII Unit can exchange data with the CPU Unit in the following five
ways.
1,2,3... 1. The CPU Unit designates its own read/write area in memory. If a PC
READ/WRITE command is then specified from the CPU Unit, the ASCII
Unit uses the PC READ/WRITE command to access the memory area in-
dicated by the CPU Unit.
2. The ASCII Unit independently accesses the CPU Unit I/O memory. The
CPU Unit’s user program is not required at all.
CPU Unit
Allocated I/O
ASCII Unit
Specify memory
read/write area
Write Bit/Read Bit
Allocated I/O
I/O memory
Read/write
Next I/O refresh
MOV
PC READ
PC WRITE
Not required
I/O memory
read/write
area
specified by
the ASCII
Unit
CPU Unit ASCII Unit
I/O memory
Read/write
Next I/O refresh
PC READ@
PC WRITE@