Fixed Scan Communication Setting; Error Detection Setting - Mitsubishi Electric MELSEC iQ-R-R00CPU 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
*1 This item is not displayed on the R00CPU, R01CPU, and R02CPU.
The send image for the fixed scan communication can be reviewed through the "Fixed Scan Communication
Function Operation Image Display".
The minimum value for the fixed scan interval setting that can be set in the R00CPU, R01CPU, and R02CPU
is 0.50ms.
Therefore, when building the multiple CPU system including the R00CPU, R01CPU, and R02CPU, set the
interval to 0.50ms or more for the CPU module to be used with.

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 128 Error
detection setting)
16 MULTIPLE CPU SYSTEM FUNCTION
302
16.4 Data Communication Between CPU Modules
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 Default
• Not Set Not Set
• Set
*1
• 0.222ms 0.888ms
*1
• 0.444ms
• 0.888ms
• 1.777ms
• 3.555ms
• 7.111ms
• R00CPU, R01CPU, • R00CPU, R01CPU,
R02CPU: 0.50 to R02CPU: 0.50ms
10.00ms • Other CPU modules:
• Other CPU modules: 0.10ms
0.10 to 10.00ms
• Not Cooperated Not Cooperated
• Cooperate