Chapter 3 Basic Functions; Operation Cycle; Relevant Variables; System Basic Cycle - Mitsubishi Electric MELSEC iQ-R Series User Manual

3
BASIC FUNCTIONS
3.1

Operation Cycle

In the motion system, operation processing related to the motion control is performed in the fixed cycle (operation cycle). This
section describes operation cycles which can be set in the motion system.

Relevant variables

Variable/Structure name
System.PrConst.
OperationCycle[1..1].Cycle
BuffermemoryRefreshCycle
Link_MotionStationRefreshType
AxisName.PrConst.
OperationCycle
System.Md.
SystemBaseCycle_Counter

System basic cycle

The system basic cycle is a basic cycle of the motion control such as operation cycle processing. System basic cycle settings
are shown below.
System basic cycle is the same as the first operation cycle.

Operation cycle settings

Operation cycle is set in System.PrConst.OperationCycle[1..1].
"Synchronize with the network setting" must be set to control real axes connected to the network.
The following table shows a reference of the operation cycle settings.
Number of control
axes
1 to 2 axes
3 to 4 axes
5 to 8 axes
9 to 16 axes
17 to 32 axes
33 to 64 axes
3 BASIC FUNCTIONS
90
3.1 Operation Cycle
Name
Operation cycle setting
Buffer memory refresh cycle setting
Refresh method of send/receive data
at motion control station
Control cycle setting
System basic cycle counter
RD78G4 RD78G8
125 s to 250 s
125 s to 250 s
250 s to 500 s

 
 
 
Details
Sets the first operation cycle. The following values can be set.
0: Synchronizes with the basic cycle of network
-11: Synchronizes with the basic cycle of network (same as "0")
-12: Synchronizes with the middle speed cycle of network
-13: Synchronizes with the low speed cycle of network
-100256 to -100001: Multiplication by n of the system basic processing (1 to
256)
Sets the buffer memory refresh cycle. The following values can be set.
0: The nth operation cycle ("n" is the slowest operation cycle among
operation cycles whose setting is enabled.)
-11: Synchronizes with the basic cycle of network
-12: Synchronizes with the middle speed cycle of network
-13: Synchronizes with the low speed cycle of network
-118192 to -110001: Multiplication by n of the first operation cycle (1 to
8192)
Sets the send/receive data refresh method of the motion syncronization
station.
0: Operates at the first operation cycle
Counts up every time when executing system basic processing.
RD78G16 RD78G32
500 s to 1.0 ms

1.0 ms to 2.0 ms
 
RD78G64
2.0 ms to 4.0 ms