CJ2 CPU Unit Software User's Manual - CIP ETI

10 CPU Unit FunctionsItemSynchronous interrupttaskDescriptionThe synchronous interrupt task is executed after the input data for the synchronousdata refresh is received by the CPU Unit. Interrupt task 2 (scheduled interrupt 0) isused for the synchronous interrupt task.Synchronous unit operation can be used without using the synchronous interrupt task.Overview of Settings for Synchronous Unit OperationThe following settings are used for synchronous unit operation.Item Description Setting methodSynchronous unit operation You can enable and disable synchronous PLC Setupunit operation.Synchronous data refresh • The Synchronous Units to be used insynchronous unit operation must be registered.• The Synchronous Data Refresh Areamust be allocated.PLC SetupThe synchronous data for each SynchronousUnit must be set.The synchronous data settings foreach Synchronous Unit isaccessed from the PLC SetupSynchronous operation cycle The synchronous cycle time is set. PLC SetupSynchronous interrupt task The program in this task is executed. Select interrupt task 2 (scheduledinterrupt 0) in the program properties.Synchronous unit operation canbe used without using the synchronousinterrupt task.Application Example Synchronizing Operation between ServomotorsIn this application, the operation of some servomotors is synchronized according to the operation ofan encoder. Here, synchronous data input to the CPU Unit from a High-speed Counter Unit is processedin a synchronous operation program in the synchronous interrupt task, e.g., a program for adigital cam. The results are output from the CPU Unit to some Position Control Units as synchronousdata to use in position control.CJ2 CPU Unit (with unitversion 1.1 or later)Example:Electronic cam controlSynchronous UnitsExample:Position Control UnitsExample:High-speed Counter UnitSynchronous datarefreshingEncoderMotor driveServomotor10-80 CJ2 CPU Unit Software User’s Manual