[Instruction] Contents

Advanced Function InstructionFUN 92 PHSCTRHARDWARE HIGH SPEED COUNTER CURRENT VALUE (CV) ACCESSFUN 92 PHSCTRCN : Hardware high speed counter number0: SC0 or HST01: SC1 or HST12: SC2 or HST23: SC3 or HST34: STA• The HSC0~HSC3 counters of FBs-PLC are 4 sets of 32bit high speed counter with the variety countingmodes such as up/down pulse, pulse-direction, AB-phase. All the 4 high speed counters are built in the ASIChardware and could perform count, compare, and send interrupt independently without the intervention of theCPU. In contrast to the software high speed counters HSC4~HSC7, which employ interrupt method torequest for CPU processing, hence if there are many counting signals or the counting frequency is high, thePLC performance (scanning speed) will be degraded dramatically. Since the current values CV of HSC0~HSC3 are built in the internal hardware circuits of ASIC, the user control program (ladder diagram) cannotretrieve them directly from ASIC. Therefore, it must employ this instruction to get the CV value from hardwareHSC and put it into the register which control program can access. The following is the arrangement of CV,PV in ASIC and their corresponding CV, PV registers of PLC for HSC0~HSC3.PLC registerASICDR4096CVCV register H LHSC0 DR4098 PV HSC0PV register H LDR4100CVCV register H LHSC1 DR4102 PV HSC1PV register H LDR4104CVCV register H LHSC2 DR4106 PV HSC2PV register H LDR4108CVCV register H LHSC3 DR4110 PV HSC3PV register H LDR4152CVCV register H LHSTA R4154 PV HSTAPV register• When access control “EN” =1 or “EN↑” ( P instruction) changes from 0→1, will gets the CV value of HSCdesignated by CN from ASIC and puts into the HSC corresponding CV register (i.e. the CV of HSC0 will beread and put into DR4096 or the CV of HSC1 will be read and put into DR4100).• Although the PV within ASIC has a corresponding PV register in CPU, but it is not necessary to access it(actually it can’t be) for that the PV value within ASIC comes from the PV register in CPU.• HSTA is a timer, which use 0.1ms as its time base. The content of CV represents elapse time counting at0.1mS tick.• For detailed applications, please refer to Chapter 10 “The high speed counter and high speed timer ofFBs-PLC”.7-77