CJ2 CPU Unit Software User's Manual - CIP ETI

10 CPU Unit Functions10-8-3 Synchronous Unit Operation SpecificationsItemApplicable CPU UnitsSpecial I/O Units and CPUBus Units that can be usedas Synchronous UnitsNumber of mountable SynchronousUnitsMounting location for SynchronousUnitsSynchronous operationcycle timeMaximum variation in synchronousoperation cycletimeI/O memory area for synchronizeddata exchange inCPU UnitTask number of synchronousinterrupt taskSpecificationCJ2H-CPU6@(-EIP) CPU Units with unit version 1.1 or laterCJ1W-NC@@4 Position Control Units10 Units max.5 Units max. for CJ1W-NC@@4 Position Control UnitsSynchronous Units must be mounted on the CPU Rack. (They will not function ifmounted on an Expansion Rack.)0.5 to 10 ms (in 0.1-ms increments)Set in the PLC Setup.The following conditions must be met:• The synchronous processing time must be less than the synchronous operationcycle time.• The internal processing time of a Synchronous Unit must be less than the synchronousoperation cycle time.10 μsThe Synchronous Data Refresh Area is separated into two sections, one for inputdata from the Synchronous Units to the CPU Unit and one for output data from theCPU Unit to the Synchronous Units. The Synchronous Data Refresh Area is fromCIO 1200 to CIO 1295. The contents depends on the Synchronous Units.Interrupt task number 2 must be used.Synchronous unit operation can be used without using the synchronous interrupttask.10-84 CJ2 CPU Unit Software User’s Manual