Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 17)

Publication 1794-6.5.11 - September 2011
Overview of the Frequency Input Module 7
Selecting the Modes of Operation
You configure the frequency input module for these modes of operation:
Output Capabilities The frequency input module has 2 assignable outputs. These outputs are
designed for applications that require fast response. The outputs:
• are current sourcing at 10…31.2V DC (1 A maximum per output)
• are electrically fused (current limited to 3 A)
• can be assigned to the associated input channel with user-selectable
frequency and acceleration values
• are isolated – this lets you use two separate external power supplies if
desired (one for output 0 and one for output 1)
Implementing Application Features
You can use the module to implement programmable application features that
are usually initiated by your controller processor. This frees up the controller
Modes of Operation
Mode Use this mode to Indicators /
Alarms Scaler /
Values
Frequency and
% Full Scale •Monitor the frequency of an input with high
accuracy (for example, shaft)
•Monitor the percentage of full scale frequency
•Operate frequency alarm (% full scale)
•Scale the frequency
•Monitor the direction of shaft rotation
•Wire-off alarm with DC devices
•Missing pulse alarm
x
x
x
x
Frequency and Acceleration •Monitor the frequency of an input with high
accuracy (for example, shaft)
•Monitor the acceleration (rate of speed change)
•Operate acceleration alarm (rate of change)
•Scale the frequency
•Monitor the direction of shaft rotation
•Wire-off alarm with DC devices
•Missing pulse alarm
x
x
x
x