Toshiba nv Series - Application as an Auto Reset Universal Counter

3.1. Operation of the universal counter
8ch Pulse Input Module PI918 Functional Manual
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3.1.2. Application as an auto reset universal counter
Theoperationisthesameasin"3.1.1.Applicationasaprogrammable
interruptoccurrencetimer"exceptthatexternalpulsesarecounted. 
Condition：
Parameter
setting
EP AL SP SV
1 0 0 0
External
input
Pulseinput Gateinput
Externalpulseconnection
ONlevel,orbatch
permission(GEN=‘1’)
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Operation：
(1) Externalinputpulsesarecounted.  Aninversionoftheinterrupt
statusbitoccursandthecountisclearedtozerowhenthecount
reachesthealarmvalue.  Foralarmvaluesof8001htoFFFFh,no
interruptconditionoccurs.  Foranalarmvalueof8000h(32768),
aninterruptoccursat"0"count.
(2) Thecountiscontinuedregardlessofthealarmvaluesetting
outsidetheinterruptoccurrencepermissionperiod(gate
permission),butnointerruptoperationisperformed.
(3)
Count operationwouldnot start, althoughthegateisenable,if
   alarmvaluesetas"0"(initialvalue).Pleasesetthealarmvalue at
   eitherfrom8001htoFFFFhtostartthecountoperation(0-32767).
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Figure 3.1.2. Example of auto reset universal counter operation
Interruptoccurrencepermission(GateON,Command'1')
Gate&Command
Externalinputpulse
Countvalue
Alarmvalue(1to32768)
Interruptstatus
0
(Inversion)
(Inversion
)
(Inversion)