Allen-Bradley 1444-AOFX00-04RB, Руководство пользователя, Страница: 108 / 550

108 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 3 Configure the 1444 Dynamic Measurement Module
Output Page
The parameters on this page are used to specify data to be included in the
Output Tag.
The module output assembly consists of one Control value and two optional
arrays of floats; two speed values and 16 alarm limit values. The optional items
are defined on this page.
Figure 46 - Module Definition - Select Data for Output
Table 17 - Data for Output Tag
Parameter Values Comments
Speed Checked (1)
Unchecked (0) Check this parameter to include two speed members in the output tag.
• Speed values written to the output tag can be used to manage FFT Bands, Alarm Gating, and other speed-related functions in the
module.
• Sometimes a machine does not have a speed sensor (tachometer) available for the module to consume directly. But often the
controller knows the speed from a drive or other system / device. While the module requires a “trigger” type signal for some
speed functions such as Order Tracking, it needs only an RPM value for others, such as Alarm Gating.
Alarms Checked (1)
Unchecked (0) Check this parameter to include 16 alarm members in the output tag.
• Alarm limit values written to the output tag can be used as Alert or Danger limit levels in one or more Measurement Alarms.
• For some applications, static alarm values are insufficient because the behavior of the measured value changes “normally” as a
function of the process. For example, the “profile” of vibration through the cycle of cutting by a machine tool follows a unique,
but repeatable, pattern as the cutting tool is at rest, moves forward, engages, cuts, disengages, retracts, and then rests again. In
other cases, the vibration response can vary “normally” based on the type of fluid being pumped, or the type of metal being
worked. In all these cases, and many more, the controller can be programmed to serve appropriate alarm limits to the module as
standard I/O. This capability helps to make sure that any deviant behavior, regardless of where the process is within the profile or
what material is being processed, is detected.