Using the IntelliLogger™
22
♦
For contact closure type inputs, internal power can optionally be supplied
from the Event input channel circuitry via a 51Kohm pull-up resistor. A
setting within the Program Net icon allows for user control of this pull-up
resistor.
♦
Channel input impedance is greater than 50Kohm.
GPDI C
OUNTER
I
NPUT
A
PPLICATION
The Counter function of the GPDI provides an accumulating total of signal transitions received
at its input. This input is well suited to counting pulses from flow meters, power meters, etc.
Configured as a Counter type input, a channel will accept a powered input signal ranging from
0 to a maximum of 30VDC or a contact closure (dry contact) input.
♦
For powered input signals, the GPDI Counter function defines signals less
than 1VDC as a Low level and greater than 4VDC as a High level.
♦
For contact closure type inputs, internal power (commonly referred to as
contact wetting current) can optionally be supplied by the Counter input
channel circuitry via a 51Kohm pull-up resistor. A setting within the Program
Net icon allows for user enable of this pull-up resistor.
♦
Channel input impedance is greater than 50Kohm.
When a mechanical switch is the source of the input signal, it is common that the mechanical
contacts of the switch will bounce a few times upon closure until they settle into a steady
closed state. The GPDI circuitry is fast enough to detect these bounces as many On/Off
signals and that signal could be logged as multiple transitions. To filter out this bouncing, a
40mS debounce/filter circuit can be enabled in the Program Net icon, which filters out this
contact bounce.
GPDI F
REQUENCY
I
NPUT
A
PPLICATION
A GPDI channel configured as a Frequency type input can measure input frequencies ranging
from approximately 10Hz to 20KHz. The channel will accurately measure frequencies of sine,
square, or sine approximating input waveforms with peak to peak amplitudes of 100mVDC to
30VDC. Channel input impedance is greater than 30Kohm within the specified input range.
For special applications, a voltage pull-up and filtering can be enabled within the GPDI
Frequency icon during construction of the Program Net. Typically these settings are not
necessary.
+5V O
UTPUT
A single 5Vdc output is provided on the System Base and can be used for driving loads as well as
sensor excitation. The state of this output is under control of the Program Net.
L
OAD
C
ONNECTIONS
The +5V output connections are on the top terminal strip and are labeled
5V Out
. Terminal 11
is the positive and 10 the negative (IntelliLogger ground).
O
UTPUT
C
HARACTERISTICS
The +5V output provides a good time, temperature and load stable 5VDC output at up to
50mA. The output is current limited and can withstand a load short indefinitely. The output
