Process Control Instructions
250 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Rate limiting is not imposed when control variable is in Manual mode unless
CVManLimiting is set.
See also
CC Function Block Tuning on page 183
The instruction always performs alarming based on CVHLimit and CVLLimit.
Limit CV by CVHLimit and CVLLimit when in auto or cascade/ratio mode.
When in manual mode, limit CV by CVHLimit and CVLLimit when
CVManLimiting is set. Otherwise limit CV by 0 and 100%.
Follow
the guidelines in this diagram:
Item Description
CVHAlarm is cleared
(1)
CVLAlarm is cleared
(1)
CVHAlarm is set
CVLAlarm is set
CV is greater than CVHLimit
CV is less than or equal to CVHLimit
CV is less than CVLLimit
CV is greater than or equal to CVLLimit
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