Output Ramping/Rate Limiting - Allen-Bradley 5069-OF8 User Manual

Output Ramping/Rate Limiting

Output Ramping limits the speed at which an analog output signal can change.
This prevents fast transitions in the output from damaging the devices that an
output module controls. Output Ramping is also known as Rate Limiting.
Table 22 describes the types of ramping that are possible.
Table 22 - Output Ramping Types
Ramping type
Ramp in Run mode
Ramp to Program mode
Ramp to Fault mode
The maximum rate of change in outputs is expressed in engineering units per
second (EU/s), is called the maximum ramp rate and set in the Ramp Rate field.
To see where to enable the Ramp in Run mode, see the following:
• 5069-OF4 module -
• 5069-OF8 module -
To enable the other Output Ramping parameters, you must change module tags
to 1.
• Ramp to Program Mode - C.Chxx.RampToProg
• Ramp to Fault Mode and Final Fault State - C.Chxx.RampToFault
For more information on using module tags, see Appendix B,
Definitions on page 133.
Rockwell Automation Publication 5000-UM005B-EN-P - November 2015
Current/Voltage Analog Output Module Features (5069-OF4, 5069-OF8)
Description
When the module is in Run mode, ramping occurs to all new output values at
the maximum ramp rate.
When the present output value changes to the Program value after a Program
command is received from the controller.
When the present output value changes to the Fault value after a
communication fault occurs.
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Chapter 5
Module Tag
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