Omron C200H-ASC11, Manual, Page: 245 / 301

236
Asynchronous Processing
Section 8-1
8-1 Asynchronous Processing
Example 1 The monitoring system allows measurement data (PV) from a controller to be
set whenever required in the shared memory of the ASCII Unit. The CPU Unit
reads this data from the ASCII Unit’s shared memory as required to monitor it.
Example 2 Here, various data is transferred between ASCII Units. The CPU Unit acts as
an intermediary.
ASCII Unit CPU Unit
Refreshes at high-speed the
measurement data from the controller to
the ASCII Unit’s shared memory using
the PC EPUT command.
→
Reads measurement data from the
ASCII Unit as required,using the IORD
(#00
@@
) instruction.
CPU Unit ASCII Unit ASCII Unit
Measurement
data
Shared
memory
Measurement
data
Shared
memory
IORD#
00
@@
PC EPUT PC EPUT
ID tag
Machine
CPU Unit ASCII Unit No. 1 ASCII Unit No. 2
Shared
memory
Shared
memory
IORD# 00
@@
IOWR# 00
@@
PC EPUT
PC EPUT