81 ADAM-4000 Series User Manual
Chapter 3 I/O Modules
3.21 ADAM-4080/4080D Counter/Frequency Input
Modules
ADAM-4080/4080D Counter/frequency input module has two 32-bit counter input
channels (counter 0 and counter 1) with built-in programmable timer for frequency
measurement. These cost-effective modules let you monitor counter/frequency data
as measurements are taken.
Front Panel LED Indicator (ADAM-4080D only)
The 5-digit LED display of the ADAM-4080D lets you monitor its counter data right at
the source. The module's LED display shows counter values as well as high-low
alarm messages when the counter exceeds its programmed limits (direct display).
Another option is to display the data sent by the host computer. The module first
sends counter data to the host computer for conversion or calculation. The host com-
puter then sends the data back to the ADAM- 4080D and displays on the module's
LED display (remote display).
Signal Input Mode
The ADAM-4080/4080D provides separate terminals for photo isolated input and
non-isolated input to simplify the wiring. Optoisolated input provides 2500 V
RMS
iso-
lation to protect your equipment from power surges at the ground terminal. After you
make the physical connections, program the module to identify which of its two input
terminals should be activated (isolated or non-isolated terminals).
Programmable Digital Filter
The ADAM-4080/4080D module includes a unique programmable digital filter to
reject noise from the input lines. You can specify separate time constant like mini-
mum signal width at high level and minimum signal width at low level. This provides
stable output readings.
Programmable Threshold
When the ADAM-4080/4080D is programmed for non-isolated input, you can set a
high and low trigger level. Like the programmable digital filter, the programmable
threshold rejects noise from the input lines and provides a stable input readings
External Control (Gate mode)
Aside from the GND and counter terminal, each channel has a gate terminal to con-
nect to an external gate signal. The gate signal (high or low) can trigger the counter
from start or stop counting. The gate mode can be among these three options, low,
high or disabled (low means that counting starts when the gate signal is low. It stops
once the gate signal becomes high)
Programmable Alarm Output
The ADAM-4080 module provides a configurable alarm for each counter. The ADAM-
4080D provides high and low alarm functions for counter 0. When the counter
reaches an alarm limit, it will trigger the built-in digital output of machine ON/OFF
control. The alarm limits may be downloaded into the module's EEPROM by the host
computer. The initial count value of ADAM-4080 module's counter can be configured
in any values.
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