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APPENDICES (3) System clock/counter Number Name Meaning Explanation SD412 1 second counter Number of counts in 1second units • This register is incremented by 1 for each second after the CPU module is set to RUN. • Count repeats from 0 to 32767 to -32768 to 0 SD414 2n second clock setting 2n second clock units • Stores value n of 2n second clock (Default is 30) • Setting can be made between 1 and 32767 SD415 2nms clock setting 2nms clock units • Stores value n of 2nms clock (Default is 30) • Setting can be made between 1 and 32767 Set by (When Set) Corresponding ACPU D9 SD420 SD430 Scan counter Low speed scan counter Number of counts in each scan Number of counts in each scan S (Status change) • This register is incremented by 1 for each scan of a lowspeed execution type program after the CPU module is set to RUN. • Count repeats from 0 to 32767 to -32768 to 0 • Used only for low speed execution type programs QCPU LCPU U Qn(H) QnPH QnPRH QnU LCPU • This register is incremented by 1 for each scan of a scan execution type program after the CPU module is set to RUN. (Not incremented for each scan of an initial execution type program.) • Count repeats from 0 to 32767 to -32768 to 0 • This register is incremented by 1 for each scan after the CPU module is set to RUN. • Count repeats from 0 to 32767 to -32768 to 0 D9022 Corresponding CPU New S (Every END processing) Q00J/Q00/Q01 Qn(H) QnPH A Appendix 3 Special Register List 319
