
JPSM
EM-1689 Rev.5
P. 3 / 8
FUNCTIONS & FEATURES
•Addingtwopulseinputs(countingnumberofpulses)andconvertingthepulserateintoconvenientengineeringunitfordisplay
on a totalizing counter or meter
•Wide frequency range up to 100 kHz (5 µsec. minimum)
•Monitor LED is provided for checking input pulse
•Accepting a wide variety of input: 0.5 – 50V at the input terminals
•Parameters can be programmed via the Programming Unit, PU-2x.
•Sampling time can be changed.
• Additional functions of the Programming Unit: monitoring input values and parameters
•Maximum output frequency limit
•Duty cycle ratio of the output pulses: 50%
EXPLANATIONS OF TERMS & FUNCTIONS
■ BASIC OPERATION
After the power is turned on, the JPSM accesses and checks the data stored in its non-volatile memory. When there is no
abnormality, it starts measuring.
After one cycle of sampling time is over, it calculates the measured results (total number of input pulses and pulse rate) to get
number of output pulses and frequency, and provides these pulses before the next sampling is complete.
Whenthecalculatedoutputfrequencyishigherthanthepresetlimit,theunitstoresthesurplusnumberofpulsesinthememory
and outputs them when the frequency become lower.
Whenthe inputcycle(inverse valueof inputfrequency:input 1)is longerthan the presetcutout time,the unitentersthe cutout
mode. However,because the cutout functionis affected onlyby the input frequency,not pulses, the cutoutmode does notaffect
the function of the JPSM. The input pulses are not cut out.
Whentheinputpulsesarecontinuouslyfed,theoutputwaveformismostlyuniformwithineachsamplingcycle. However,when
the input pulses are stopped in a particular timing, the last pulse string may be provided in low frequency, and so may be the
first pulse string.
Remark: The cutout time is set so that the transmitter forcibly discontinues a sampling cycle and outputs 0 Hz.
■ SCALING FACTOR, INPUT SPAN FREQUENCY & OUTPUT SPAN FREQUENCY
Thescalingfactor,rateof number ofoutputpulsesdividedbynumber ofinputpulses,aredeterminedby twoparameters: input
span frequency and output span frequency.
Although there are also input zero frequency and output zero frequency, they are fixed to zero (0) Hz.
These span frequencies are only used to determine the rate, therefore they do not limit actual input / output frequencies. For
example,ifyousettheinputspanfrequencyto1Hzandtheoutputspanfrequencyto2Hz,youcaninput1000Hzandthenumber
of output pulses are twice as much as the input, approximately 2 kHz.
■ OPERATION MODE AND MAINTENANCE SWITCH
There are two operation modes: MONITOR mode and PROGRAM mode.
Whenthe power supplyis turnedon,the unitstarts upinMONITOR mode. However,you canswitchfrom onemode toanother
by operating the Programming Unit.
InMONITOR mode (Maintenance Switch =0), the unit is innormal operation: repeating measuring, calculatingand renewing
the output signal. In this status, the status indicator LED is blinking in constant intervals of approx. 3 Hz (ON : OFF = 1 : 1).
You can monitor input frequency, input %, output % and operating status, various parameters, etc. on the Programming Unit.
ThePROGRAMmode(MaintenanceSwitch=1)isusedwhenyouchangevariousparametersconcerningmeasuring,calculation
and output. In this status, the status indicator LED is blinking in constant intervals of approx. 1.5 Hz (ON : OFF = 1 : 1). In
thetransitionperiodfromMONITORtoPROGRAMmode,theLEDblinksapprox.in1.5Hzbutindifferentintervals(ON:OFF
= 1 : 3), which indicates that the unit is still processing the last cycle of measuring.
InPROGRAMmode,theunitstopsmeasuringand renewingtheoutputsignal. Theoutputisheld,butyou canoutputaspecific
value for simulation and testing.
When all the program change is over, be sure to return the transmitter to MONITOR mode. The modification will be lost if you
turn off power supply to the transmitter without doing this.
MONITOR MODE
Measuring Processing
Monitor. Parameters
Available
Monitor. Measuring
Value Available
PROGRAM MODE
Measuring Stopped
Changing Parameters
Available
Output Simulation
Available
Maintenance Switch = 1
Maintenance Switch = 0
Parameters Saved
in the Nonvolatile Memory.
Power
Turned ON