158
8 MULTIPLE CPU SYSTEM FUNCTIONS
8.4 Data Communication Between CPU Modules
Fixed scan communication setting
Set the interval for data transfer between CPU modules. It also can be synchronized with the timing of the inter-module
synchronization cycle. (
MELSEC iQ-R Inter-Module Synchronization Function Reference Manual)
[System Parameter]
[Multiple CPU Setting]
[Fixed Scan Communication Setting]
[Fixed Scan Interval Setting of
Fixed Scan Communication]
Window
Displayed items
*1 The maximum area size which can be set in the fixed cycle communication area varies depending on the fixed cycle interval. (
156 Setting fixed cycle communication area)
• The send image for the fixed cycle communication can be checked by selecting "Fixed Scan
Communication Function Operation Image Display".
• When "Fixed Scan Communication Function and Inter-module Synchronization Function" is set to "Not
Cooperated", the timing will not be match even if the same value is set for the interval of both the fixed cycle
communication interval and the inter-module synchronization setting.
Error detection setting
During data transfer among the CPU modules in a multiple CPU system, data inconsistency may occur because of time
required for writing all data within the fixed cycle. To detect or not to detect a continuation error can be set with this setting.
(
Page 64 Error detection setting)
Item
Description
Setting range
Default
0.05 ms Unit Setting
Set whether to set the fixed scan interval setting in 0.05 ms unit.
• Not Set
• Set
Not Set
Fixed Scan Interval Setting (Not Set by 0.05
ms)
Set the cycle of fixed cycle communication interval by selecting
from the items of the setting range.
Set the same settings only for the CPUs which are used by the
fixed cycle communication function.
• 0.222 ms
• 0.444 ms
• 0.888 ms
• 1.777 ms
• 3.555 ms
• 7.111 ms
0.888 ms
Fixed Scan Interval Setting (Set by 0.05 ms)
Set any value as a fixed cycle communication interval in 0.05 ms
unit.
0.10 ms to 10.00 ms
0.10 ms
Fixed Scan Communication Function and Inter-
module Synchronization Function
Set whether to operate the fixed cycle communication between
CPUs matched with the cycle set in "Synchronization Setting
within the Modules".
• Not Cooperated
• Cooperate
Not
Cooperated
Содержание MELSEC iQ-R C R12CCPU-V
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