Honeywell HC900 - ROC Rate of Change Function Block

Function Blocks
ROC Rate of Change Function Block
322 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
ROC Rate of Change Function Block
Description
The ROC label stands for Rate of Change.
This block is part of the Auxiliary category.
Function
Provides:
• an analog output representing units per minute change of the analog input.
• compare setpoints for high and low rate of change.
• compare selections for increasing, decreasing or both directions of change.
• a logic 1(ON) output when input rate exceeds high rate setpoint
• a logic 1(ON) output when input rate is less than the low rate setpoint.
Inputs
IN
= Analog Input
Outputs
HI_RC
= ON if input rate exceeds High Rate setpoint
LO_RC = ON if input rate is less than the Low Rate setpoint
RATE = Analog Output representing Engineering Units per minute of change of the Analog Input