Mitsubishi Electric MELSEC Q Series User Manual page 172

(2) Multiple CPU high speed transmission area setting
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.
Table4.7 List of parameter setting/display item for CPU specific send renge setting
Item
CPU specific send
Sets the number of points of data that each CPU module sends.
range
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.
*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
Figure 4.26 CPU specific send range setting screen
Setting description
Default value of CPU specific send range
CPU No.1
7k points 7k points
7k points 3k points
3k points 3k points
CHAPTER4 COMMUNICATIONS BETWEEN CPU MODULES
Setting/display value
Setting range: 0 to 14.0k points
*1
Setting unit: 1.0k point
Display range: 0 to 14335 points
Display range: 0 to 14335 points
CPU No.2 CPU No.3
----
3k points
3k points
1
2
3
4
5
6
7
8
*4
CPU No.4
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----
3k points
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