Yaskawa MP920 User's Manual Design - Manual (Page 440)

9.2 Setting Up a Multi-CPU System
9-13
9
5. Settings on the Common Memory Assignment Tab Page of the System Configuration
Window
With a Multi-CPU System, the data in specified M registers can be input and output dur-
ing the specified scan between the CPU Modules. The data is copied at the start of the
specified scan. The I/O registers must be assigned so that they do not overlap. Click the
Common Memory Assignment Tab in the System Configuration Window to open the
tab page to assign shared memory.
Fig. 9.10 Common Memory Assignment Tab Page
Input the following items on this tab page: Read source MW register addresses from the
other CPU Module (the same addresses as the read destination of this CPU Module) and
the scan during which to execute I/O processing to read data (high-speed scan or low-
speed scan).
Table 9.4 Scan Selection
HO/LO Settings Writes the contents of the M registers specified in this CPU Module to
the M registers with the same addresses in the other CPU Module.
HO will execute the write during the system I/O processing in the high-
speed scan. LO will execute the write during the system I/O processing
in the low-speed scan. Select HO when the user ladder program is
being used in the high-speed scan and select LO when the user ladder
program is being used in the low-speed scan.