Mitsubishi MELSEC-Q Series User Manual page 178

4
COMMUNICATIONS BETWEEN CPU MODULES
(2) Multiple CPU high speed transmission area setting
Table4.7 List of parameter setting/display item for CPU specific send renge setting
Item
Sets the number of points of data that each CPU module
CPU specific send
range
sends.
Used when communicating with the other CPU using the
program.
User setting area The value where the "number of points set in the auto refresh"
is subtracted from the "CPU specific send range setting" is
displayed.
Used when communicating with the other CPU using the auto
refresh.
Auto refresh
Number of points that is set by the "auto refresh setting" is
displayed.
4
- 28 4.1 Communications between CPU modules using CPU shared memory
4.1.3 Communication by auto refresh using multiple CPU high speed transmission area
To perform auto refresh in CPU shared memory, set the number of points to be sent
from each CPU module (Send range for each PLC) and a device for storing data
(Auto refresh settings) on Multiple CPU settings in PLC parameter.
(a) CPU specific send range setting
CPU specific send range setting sets the number of points of multiple CPU high
speed transmission area that is allocated to the each CPU module which
constitutes the Multiple CPU system.
CPU specific send range setting screen and the setting range are shown below.
Setting description
*1
* 1: The following number of points is set by the default.
Number of CPUs
Two CPUs
Three CPUs
Four CPUs
* 2: Sets the total of all CPUs to be the following points or lower.
• When constituted with two CPUs: 14k points
• When constituted with three CPUs: 13k points
• When constituted with four CPUs: 12k points
Diagram 4.26 CPU specific send range setting screen
Default value of CPU specific send range
CPU No.1 CPU No.2
7k points 7k points
7k points 3k points
3k points 3k points
Setting/display value
Setting range: 0 to 14.0k points
Setting unit: 1.0k point
Display range: 0 to 14335 points
Display range: 0 to 14335 points
CPU No.3 CPU No.4
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3k points
3k points 3k points
*4
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