Impulse MAQ20-940 Configuration - Manual (Page 19)

MAQ ® 20 Configuration Software Tool User Manual
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7.2 Discrete I/O Special Function Alarms:
The Discrete I/O Module can perform seven special functions. Some of these special functions use set
pairs of channels. This area of the panel sets the alarm conditions for Discrete Input channels 5-6 and 7-
8.
7.2.1 Inputs: Use this drop-down box to select the channels for which alarms will be set: Ch 5-
6 or Ch 7-8.
7.2.2
Function: Select the function from the drop-down box. There are only four Special
Functions that can have alarms: Pulse/Frequency Counter (Pulse/Freq Counter),
Pulse/Frequency Counter with De-bounce (Pulse/Freq Ctr Debnc), Waveform
Measurement, and Time Between Events. Only one of these can be configured at a time
for each channel pair.
7.2.3 Alarm: Each special function has different parameters it monitors for alarms, which are
one or more of the following: Pulse Count, Frequency, RPM, Events Measured, Positive
Pulse Width and Time Between Events.
7.2.4 Alarm Type: Tracking or Latching. Tracking: This type of alarm will trigger once the
conditions are met and will reset when the alarm conditions are no longer present.
Latching: This type of alarm will trigger once the conditions are met and will not reset
until the user resets it manually, even if the alarm condition is no longer present.
7.2.5 Alarm Limit: Select the limit that will be monitored. Options are: Low, High, High & Low,
Low & Low-Low, High & High-High, and All Limits.
7.2.6 Alarm Out: Any alarm can have two outputs. An alarm condition can either be reported
by only a flag or by a flag and an action sent to a discrete output channel. If a discrete
output channel is selected, the output can be set High or Low on alarm. Alarms are
mapped to specific output channels. For input channels 5-6 the High-Low alarm is
mapped to Output Channel 0 and High-High Low-Low alarm is mapped to Output
Channel 1. For input channels 7-8 the High-Low alarm is mapped to Output Channel 2
and High-High Low-Low alarm is mapped to Output Channel 3. In the Alarm Out drop-
down box there are two words separated by a comma; the first word is for High-Low
alarms and the second is for High-High Low-Low alarms. Atv Low will mean that when
the alarm is triggered the alarm output will go Low, Atv High is the opposite and Reg will
not use an output it will just report to a register.
Alarm Output Status
Untriggered Triggered
Atv Low 1 0
Atv High 0 1
Reg Unchanged Unchanged
7.2.7 Limits: Alarm limits are set based on the required function and action. DB stands for
deadband. Once alarm configuration is complete, press the Set button to send the data
to the module and the Save button to store the data in the module nonvolatile memory.
To clear an alarm setting, press the Reset button followed by the Save button.