Figure 2-57 Roc Function Block Responses - Honeywell UMC800 Reference Manual

Function Blocks
2.55 ROC Function Block,
Example
Figure 2-57 illustriates various responses for the Rate Of Change Function Block. You can also use the
ROC block to alarm if Rate exceeds the Preset Setpoint Limit.
High Rate SP (INC )
HI rate SP (INC)
HI RC = ON
HI rate SP (INC)
HI RC = OFF
High Rate SP (DEC )
HI RC = ON
HI rate SP (DEC)
HI RC = OFF
HI rate SP (DEC)
170
continued
LOW Rate SP (INC)
LO rate SP (INC)
LO RC = OFF
LO rate SP (INC)
LO RC = ON
LOW Rate SP (DEC)
LO RC = OFF
LO rate SP (DEC)
LO RC = ON
LO rate SP (DEC)

Figure 2-57 ROC Function Block Responses

Signal Tags
Place in Overview Display
group to view rate
Figure 2-58 ROC Function Block Example
Function Block Reference Guide
High/Low Rate SP (Both)
Place in Alarm group for
Alarm detection/annunciation
HI rate SP (INC)
LO rate SP (INC)
HI RC = OFF
LO RC = OFF
LO rate SP (DEC)
HI rate SP (DEC)
HI rate SP (INC)
LO rate SP (INC)
HI RC = OFF
LO RC = ON
LO rate SP (DEC)
HI rate SP (DEC)
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