Toshiba nv-pack, Manual

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Chapter 3 Functions
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3.2.2 Transmission between PLC and Windows
Note
Since the transmission between PLC and Windows is a downward compatible for shared
memory, do not use unless there are special circumstances.
By transmission between PLC and Windows, PLC and Windows send and
receive each Station Global at regular intervals and refresh their respective
memories (common memory area and Windows inter-process shared memory).
User application on Windows can indirectly access the common memory area
(Station Global) of typeFR via C3COM.
Guset OS (Windows)
C3COM
Windows inter-process shared memory
Host OS
PLC
Common Memory Area
Transmission between
PLC and Windows
refresh refresh
Figure3.6.
Transmission between PLC and Windows
Note
It may be restricted packet sending / receiving for the transmission between PLC and
Windows when CPU load is high in the host or the guest.
For example, if the Windows service
or user application process is started and operated and the guest's CPU load transiently
approaches 100%, the packet will be restricted.
How to set the transmission between PLC and Windows up is shown below.
Dedicated virtual Ethernet is used for the transmission between PLC and
Windows. The virtual Ethernet is set according to the following (1).
(1) Add CPU Function
Register the Virtual Ethernet (VENPort) in CPU with nV-Tool. Set the
transmission between PLC and Windows to "Yes" of the module parameter.