CJ2 CPU Unit Software User's Manual - CIP ETI

AppendicesNote A530 is normally cleared when power is turned OFF. To prevent this, the IOM Hold Bit (A500.12) must beturned ON and the PLC Setup must be set to maintain the setting of the IOM Hold Bit at Startup, or the followingtype of instruction must be included at the beginning of the program to set A530 to A5A5 Hex.A200.11First Cycle FlagMOV#A5A5A530Set A530 to A5A5 Hex at the beginningof the program to enable disablingpower interruption processing.3 Disable the Power OFF Interrupt Task in the PLC Setup.With the above procedure, all instructions between DI(693) and EI(694) (or END) will be completed*1 before the Power OFF Interrupt is executed even if the power interruption occurs whileexecuting the instructions between DI(693) and EI(694).*1 The protected instructions can be completed only when the time required to complete execution is less than orequal to the processing time after power interruption detection (10 ms − power interruption detection delaytime). If the instructions is not completed within this time, they will be interrupted and the above processing willbe performed.Note 1 The processing time after a power interruption is detected is 1 ms when a CJ1W-PD022 is mounted.2 If the Power OFF Interrupt Task is not disabled in the PLC Setup, the Power OFF Interrupt Task will be executed,and the CPU Unit will be reset without executing the protected instructions as soon as the powerinterruption is detected.3 If a power interrupt is detected while DI(693) is being executed, the CPU Unit will be reset without executingthe protected instructions.85% of rated voltageOperation always stoppedat this point regardless.(PD025: 80%,PD022: 90%)Power OFFdetected signalHolding time for 5 V internal powersupply after power OFF detection:Always 10 ms (PD022: 1 ms)Power OFF detected Power OFF confirmedPower OFF detection time:AC: 10 to 25 msPD025: 2 to 5 msPD022: 2 to 10 ms(Power OFFundetermined)Power OFF DetectionDelay Time: 0 to 10 ms(set in PLC Setup)Processing time after power OFF is confirmed:10 ms minus Power OFF Detection Delay TimePD022: 1 ms minus Power OFF DetectionDelay Time)Note: The interrupt task execution time must beless than or equal to processing time afterProgram executionstatusCPU reset signalCyclic tasks or interrupt tasksnot associated with power OFFDI(693)EI(694)Instructions betweenDI(693) and EI(694)are executed.If A530 (Power Interrupt Disabled Area Setting) is set to any value other than A5A5 hex to enable maskingpower interruption processing, power interrupt processing will be started after completing executionof the current instruction.StoppedAdditional InformationInterrupt processing is performed according to the contents of A530 and the PLC Setup asshown below.Power interrupt processingPower OFFInterrupt Task(PLC Setup)DisabledEnabledA530 (Power Interrupt Disabled Area Setting)A5A5 hex (enable masking powerinterrupt processing)All instructions between DI(693)and EI(694) are executed and theCPU Unit is reset.Other (disable masking power interruptprocessing)Execution of the current instructionis completed and the CPU Unit isreset.Execution of the current instruction is completed, the Power OFF InterruptTask is executed, and the CPU Unit is reset.A-146 CJ2 CPU Unit Software User’s Manual