Honeywell HC900 Reference Manual page 325

Inputs
IN = PV Input (Analog input signal).
DFLT = The Output is set to this value if no ramps are enabled. It typically comes from another Ramp
block, thus allowing ramps to be stacked together.
EN [1-4] = Enables or disables the associated scale.
OV [1-4] = When ON, overrides the output of the associated scale to the high or low limit value depending
on the state of OV HI.
OV HI = determines the limit value of the selected scale when it is overridden. ON=override high,
OFF=override low
DIS = Normally OFF. If ON, then OUT = the configured Off-Value
Output
OUT = Enabled = the scale/ramp output, Disabled = the user configured Off-Value
Scale Limits
PV input values that are outside of the input low limit and input high limit settings are not processed. The
output value is clamped based on the input limits. The input low and high limits may be inverted,
(for example: input low limit > input high limit) to reverse scale the output.
Block properties
The Ramp properties dialog box is divided into FIVE tab cards:
GENERAL
RAMP 1
RAMP 2
RAMP 3
RAMP 4
Click on the tab to access the properties for that tab.
Revision 11
2/07
HC900 Hybrid Control Designer Function Block Reference Guide
Function Blocks
RAMP Function Block
311