10-83
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-8 Synchronous Unit
Operation
10
10-8-1 Overview
The following settings are used for synchronous unit operation.
z Synchronizing Operation between Servomotors
In this application, the operation of some servomotors is synchronized according to the operation of
an encoder. Here, synchronous data input to the CPU Unit from a High-speed Counter Unit is pro-
cessed in a synchronous operation program in the synchronous interrupt task, e.g., a program for a
digital cam. The results are output from the CPU Unit to some Position Control Units as synchro-
nous data to use in position control.
Synchronous interrupt
task
The synchronous interrupt task is executed after the input data for the synchronous
data refresh is received by the CPU Unit. Interrupt task 2 (scheduled interrupt 0) is
used for the synchronous interrupt task.
Synchronous unit operation can be used without using the synchronous interrupt task.
Overview of Settings for Synchronous Unit Operation
Item Description Setting method
Synchronous unit operation You can enable and disable synchronous
unit operation.
PLC Setup
Synchronous data refresh • The Synchronous Units to be used in
synchronous unit operation must be reg-
istered.
• The Synchronous Data Refresh Area
must be allocated.
PLC Setup
The synchronous data for each Synchro-
nous Unit must be set.
The synchronous data settings for
each Synchronous Unit is
accessed from the PLC Setup
Synchronous operation cycle The synchronous cycle time is set. PLC Setup
Synchronous interrupt task The program in this task is executed. Select interrupt task 2 (scheduled
interrupt 0) in the program proper-
ties.
Synchronous unit operation can
be used without using the syn-
chronous interrupt task.
Application Example
Item Description
CJ2 CPU Unit (with unit
version 1.1 or later)
Example:
Electronic cam control
Synchronous Units
Example:
Position Control Units
Synchronous data
refreshing
Motor drive
Servomotor
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