CJ2 CPU Unit Software User's Manual - CIP ETI

10 CPU Unit Functions Checking the SYNC Indicators on the Fronts of Synchronous UnitsThe SYNC indicator on the front of a Synchronous Unit will be lit green when the Unit is in SynchronousUnit Operation Mode. This indicator will go out for synchronous output data reception errorsand other errors.Additional Information10-8 Synchronous UnitOperationThe following bits are allocated to the Synchronous Unit in the Special I/O Unit Area or CPU BusUnit Area. This bits can be used in the user programming in the CPU Unit to check and controlthe status of the Synchronous Units.10I/O classification Size Name FunctionInput bits allocatedin the Special I/OUnit Area or CPUBus Unit Area(input to CPU Unit)Output bits allocatedin the SpecialI/O Unit Area orCPU Bus Unit Area(output from CPUUnit)1 bit Synchronous UnitOperation ModeFlag1 bit Synchronous DataReceive WarningFlag1 bit Synchronous DataReceive Error Flag1 bit Synchronous ProcessingTime OverFlag1 bit Unit Error ResetBit1 bit Unit WarningReset BitThis flag will be ON while the Synchronous Unit isoperating in Synchronous Unit Operation Mode. (Thisflag has the same status as the SYNC indicator on theSynchronous Unit.)This flag will be ON if the Synchronous Unit has failedto receive synchronous data sent from the CPU Uniteven one time.This flag will be ON if the Synchronous Unit has failedto receive synchronous data sent from the CPU Unittwo or more times in a row.This flag will be ON if the internal processing time inthe Synchronous Unit has exceeded the synchronousoperation cycle time one or more times.Turn ON this bit to reset errors, such as synchronousdata reception errors, in the Synchronous Unit.Turn ON this bit to reset warnings, such as synchronousdata reception warnings and synchronous processingtime exceeded warnings, in the SynchronousUnit.10-8-9 Adjusting and Troubleshooting Synchronous Unit OperationStoppage of Synchronous Unit OperationSynchronous Signal Monitoring ErrorsIf the synchronous signal from the CPU Unit to Synchronous Unit is not generated for over 100 msduring normal operation and 11 s at startup, all Synchronous Units and all synchronous unit operationwill be stopped.I/O Bus or Synchronous Unit ErrorsIf even one Synchronous Unit has an I/O bus error or any of the following Unit errors, all SynchronousUnits and all synchronous unit operation will be stopped.• I/O setting error• Duplicate unit number error• Special I/O Unit setting error• CPU Bus Unit setting error• Special I/O Unit error• CPU Bus Unit errorA dialog box that shows the error will be displayed on the CX-Programmer.CJ2 CPU Unit Software User’s Manual10-97