Fixed Scan Communication Setting; Error Detection Setting - Mitsubishi Electric MELSEC iQ-R Series User Manual

Fixed scan communication setting

This menu item sets up the interval for data transfer between CPU modules. The data transfer interval can be synchronized
with the timing for 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
Item
0.05ms Unit Setting
Fixed Scan Interval Setting (Not Set by
0.05ms)
Fixed Scan Interval Setting (Set by 0.05ms)
Fixed Scan Communication Function and
Inter-module Synchronization Function
The send image for the fixed scan communication can be reviewed through the "Fixed Scan Communication
Function Operation Image Display".

Error detection setting

When data is communicated among the CPU modules in a multiple CPU system, some data writing timing may lead to a
failure of the complete data communication in the fixed scan communication cycle after the data writing and data
inconsistency may occur. In this setting, set whether to detect a continuation error or not in this case. ( Page 203 Error
detection setting)
Description
Specify whether to set the fixed scan communication cycle
in increments of 0.05ms.
Select the fixed scan communication cycle from the drop-
down list. The same option should be specified only for
CPU modules which will use the fixed scan communication
function.
Specify the fixed scan communication cycle freely in
increments of 0.05ms.
Set whether the fixed scan communication cycle
cooperates with the inter-module synchronization cycle.
Setting range
• Not Set
• Set
• 0.222ms
• 0.444ms
• 0.888ms
• 1.777ms
• 3.555ms
• 7.111ms
0.10 to 10.00ms
• Not Cooperated
• Cooperate
23 MULTIPLE CPU SYSTEM FUNCTION
23.4 Data Communication Between CPU Modules
Default
Not Set
23
0.888ms
0.10ms
Not Cooperated
349