Rockwell Automation Publication 5000-UM005B-EN-P - November 2015 47
Current/Voltage Analog Input Module Features (5069-IF8) Chapter 3
Rate Alarm
The Rate Alarm defines the maximum rate of change between input samples in
Engineering Units per second. If the Rate Alarm Limit is exceeded, the
I.Chxx.RateAlarm tag set to 1.
You can enable Rate Alarm latching. To see where to enable the Rate Alarm
latching on the 5069-IF4 module, see
page 93.
Once the Rate Alarm is latched, you must change the O.Chxx.RateAlarmUnlatch
tag to 1.
You can unlatch the alarm at any point in the system operation. If you change the
unlatch tag to 1 and the triggering condition remains, the alarm is immediately
latched again.
We suggest that you unlatch the Rate Alarm only after the rate of change between
input samples has returned below the Rate Alarm Limit value.
Sensor Offset
The Sensor Offset compensates for any known error on the sensor or channel to
which the sensor is connected. The value is set in signal units and is added to the
data value.
For example, consider an application that uses the Current (mA) input type with
the 4…20 mA range and scaling at 0…100%. If a sensor has an error and the
channel consistently reports current signal values by 0.2 mA lower than the actual
value, you must set Sensor Offset to 1.25%.
You must use the O.Chxx.SensorOffset tag to set the Sensor Offset. In the example
above, the O.Chxx.SensorOffset tag = 1.25.
For more information on how to use the module tags, see Appendix B,
Module
Tag Definitions on page 133.
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