1 MULTIPLE CPU SYSTEM
1.3 Data Communication Between CPU Modules in the Multiple CPU System
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1
Relationship between fixed scan communication and inter-
module synchronization
If using fixed scan communication and inter-module synchronization between multiple CPUs, the relationship between motion
operations and Motion SFC event task (fixed-cycle tasks) is as follows.
*1 If inter-module synchronization function is set to not used, or if the Motion CPU is not the module subject to inter-module
synchronization.
*2 If the motion operation cycle and fixed scan communication cycle, or the inter-module synchronization cycle differ, the start timing with
longer cycle is always synchronized with the start timing with shorter cycle.
If a cycle (other than 0.222ms, 0.444ms, 0.888ms, 1.777ms, 3.555ms, 7.111ms) not compatible with Motion
CPUs is set for a fixed scan communication cycle or inter-module synchronization cycle, a moderate error
(error code: 2222H) occurs when the Multiple CPU system power supply is turned ON.
Timing Example 1
Timing Example 2
Timing Example 3
Inter-module synchronization function
Not used
*1
Used
Fixed scan
communication
function
Not used Motion CPU inherent cycle Synchronization with inter-module
synchronization cycle
*2
(timing example 2)
Used If the "Fixed scan communication function
and inter-module synchronization function"
setting is "Not cooperated".
Synchronization with fixed scan
communication cycle
*2
(timing example 1)
Moderate error
(error code: 2222H)
If the "Fixed scan communication function
and inter-module synchronization function "
setting is "Cooperate".
Setting not possible with Engineering
Tool
Inter-module synchronization cycle
=synchronization with fixed scan
communication cycle
*2
(timing example 3)
Fixed scan communication
timing
Motion operation
Inter-module
synchronization timing
Motion operation
Inter-module
synchronization timing
Fixed scan communication
timing
Motion operation
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