ADAM-4000 Series User Manual 82
The alarm functions can be enabled or disabled remotely. When the alarm functions
are enabled, digital output channels are used to indicate the alarm states. For ADAM-
4080, digital output channel 0 equals to the alarm state of counter 0, and digital out-
put channel 1 equals to the alarm state of counter 1. For ADAM-4080D, digital output
channel 0 equals to the low alarm state of counter 0, and digital output channel 1
equals to the high alarm state of counter 0.
Every A/D conversion will be followed by a comparison of alarm limits. If the input
value exceeds one of these limits, the corresponding alarm state is set to ON.
There are two alarm mode options, momentary and latching, for ADAM-4080D. If the
alarm is in latching mode, the alarm will stay on even when the input value returns
within the limits. An alarm in latching mode can be turned off by issuing a Clear Alarm
command from the host computer. A latching alarm is cleared by the module when
the opposite alarm is set. For example, the alarm is in latching mode and the high
alarm is then turned ON. When the module receives a value that is lower than the low
alarm limit, it will clear the high alarm and turn the low alarm ON.
When the alarm is in Momentary mode, the alarm will be turned OFF as soon as the
input value returns within the limits. The arrangement of coupling high and low alarm
states with digital output lines may be utilized to build ON/OFF controllers that can
operate without the host computer involvement.
3.21.1 ADAM-4080 Counter/Frequency Input Modules
Figure 3.75 ADAM-4080 Counter/Frequency Input Module
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