Mitsubishi MELSEC-Q Series User Manual page 164

4
COMMUNICATIONS BETWEEN CPU MODULES
High
Basic Process
Performance
Note4.4
Note4
High
Basic Process
Performance
Note4.4
4
- 14 4.1 Communications between CPU modules using CPU shared memory
4.1.2 Communication by auto refresh using CPU shared memory
5) The same number of send points must be set for all CPUs in the multiple CPU
system.
If different number of send points is set for a CPU, "PARAMETER ERROR"
occurs in the consistency check between CPUs.
( Section 6.1 (3))
For details of consistency check between CPUs, refer to Section 6.1.
(b) CPU devices
The following devices can be used for auto refresh purposes (other devices
cannot be set up with the GX Developer.)
Settable devices
Data register (D)
Link register (W)
File register (R, ZR)
Link relay (B)
Internal relay (M)
Output (Y)
1) For setting the CPU side devices, the following 2 methods are available.
• Method of setting devices from the startive device of CPU No.1
consecutively
• Method of setting devices for each CPU module
Diagram 4.11 Selection of setting method for the CPU side devices
2) The CPU side devices use the device range of points set for each CPU module
from the set startive device.
Set a device number so that the necessary amount of send point devices can
be secured.
Sixteen times the number of send points will be set if a bit device is specified in
the CPU device.
(Example) If the total number of send points for all CPU modules is 10,
then 160 points of B0 to B9F are set when B0 link relay is specified.
For Basic model QCPUs and High Performance model QCPUs/Process CPUs of which the first 5
digits of serial No. is "07031" or earlier, auto refresh is available only by setting devices
consecutively from the starting device of CPU No.1.
In addition, when using GX Developer of Version 8.22Y or earlier, auto refresh is also available
only by setting devices consecutively from the starting device of CPU No.1.
Table4.3 Devices used for auto refresh
Specify 0 or multiples of 16 for the first number.
Set starting devices for each PLC. :
Method of setting devices from the
startive device of CPU No.1 consecutively
Set starting devices for each PLC. :
Method of setting devices for each
CPU module optionally
Caution
None
Note4.4
optionallyNote4