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16 MULTIPLE CPU SYSTEM FUNCTION
16.4 Data Communication Between CPU Modules
Setting the data communication with fixed scan communication area
This section describes the setting for making the data communication with fixed scan communication area.
■Setting whether or not it should be used
To communicate data with the fixed scan communication area, "Enable" must be set to "Fixed Scan Communication
Function".
[System Parameter] [Multiple CPU Setting] [Communication Setting between CPUs] [Fixed Scan
Communication Function]
■Setting fixed scan communication area
This menu item sets up the range of send area for each CPU in the fixed scan communication area (the refresh area and the
total of areas used for direct access communication). Only the fixed scan communication area can be changed with the
parameter settings. The other areas are not configurable.
[System Parameter] [Multiple CPU Setting] [Communication Setting between CPUs] [Fixed Scan
Communication Area Setting]
*1 The max area size that can be set through setting of the fixed scan communication area differs depending on the fixed scan
communication cycle.
Item Description Setting range Default
Fixed Scan Communication
Function
Specify whether or not the fixed scan communication function
should be used.
•Not Use
•Use
Not Use
Item Description Setting range Default
Total [K Word] View the total value. Entire system: 0 to 24K words
*1
PLC No. 1 [Start XY: U3E0] Set the send area size for CPU No.1. 0 to 12K words 0K word
PLC No. 2 [Start XY: U3E1] Set the send area size for CPU No.2. 0 to 12K words 0K word
PLC No. 3 [Start XY: U3E2] Set the send area size for CPU No.3. 0 to 12K words 0K word
PLC No. 4 [Start XY: U3E3] Set the send area size for CPU No.4. 0 to 12K words 0K word
Fixed scan communication cycle Max area size that can be set through setting of the fixed scan
communication area
0.10ms 12K points
0.15ms 20K points
Except for shown above 24K points
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