Function Blocks
STG Stage Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 365
2/07
Inputs
PV1 =
Analog Input #1 - can be pressure or flow – common to all four stages.
PV2 = Analog Input #2 - can be pressure or flow – common to all four stages.
EN1 – EN4
= ON enables the associated stage. OFF causes the associated request output [OUT1-OUT4] to
turn OFF. This condition overrides the OVON/OVOFF inputs. When EN [1-4] turns ON the stage
algorithm is reevaluated to determine the state of OUT (request).
OVON1 – OVON4 = Overrides the output of the associated stage [1-4]
ON = override signal to
ON
OFF = no override
OVOFF1 – OVOFF4 =. Overrides the output of the associated stage [1-4]
ON = override signal to
OFF
OFF = no override
If both OVON and OVOFF are ON, OVOFF takes precedence.
INTRLK IN = Interlocking signal from previous attached stage function block. (note 1)
Outputs
OUT1 – OUT4
= ON = Stage [1-4] request is ON
INTRLK OUT = Interlocking signal to interlock the 4
th
Stage of this block to the first Stage of the next
block in sequence. (note 1)
Note 1. In cases where two or more stage blocks are tied together, the sequence order should be
programmed in an ascending sequence to match the desired order of operation. Failure to maintain
sequence could cause multiple scans to be required for sequential operations.
Block properties
The Stage properties dialog box is divided into FIVE tab cards:
GENERAL
STAGE 1
STAGE 2
STAGE 3
STAGE 4
Click on the tab to access the properties for that tab.
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