Using the IntelliLogger™
48
Using Channels as High Speed Counter Inputs
When configured as a high-speed Counter Input, high speed hardware counters on the
channel increment their internal count with each Low to High or High to Low transition
received (as programmed). This running count total is then read from this hardware
counter and optionally cleared as programmed by the user in the Program Net.
An example of a Counter-type sensor input is a pulse output power meter where each
pulse corresponds to a Watt-hour of energy. By accumulating these counts over a period
of time, the energy used during that period can be totalized (eg a month).
TIP: Counter values can be programmed in the Program Net to
continually increment or be cleared (reset to zero) after each read. Pay
special attention to the counter settings in the HyperWare dialog boxes
when setting up your Program Net.
Figure 3-21; Interfacing various signal types to the ILIM-2 Event/Counter Input Channels
E
VENT
/ C
OUNTER
S
IGNAL
S
PECIFICATIONS
:
Whether used in Counter mode or Event mode, all Digital Inputs on the ILIM-2 share
these same input signal specifications:
♦
Input Voltage Limits: Powered input signals for these Inputs may
range from 0VDC to a maximum of 30VDC. Voltages outside these
ranges may damage the Module.
♦
Logic Voltage Thresholds: For powered input signals a digital signal
of less than 0.8 Volts is considered a Logic “Low” signal, and
voltages greater than +2.0 Volts as a Logic “High” signal. Digital
Input channels have a built in Hysteresis of approximately 0.3 Volts
to improve signal acquisition.
