Honeywell HC900 Reference Guide

Function Blocks
STG Stage Function Block
368 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Presets
The Stage type selection pre-assigns inputs and Hi/Lo setpoint comparisons as indicated in HTable 108.
These cannot be altered. The User-configurable type may be used to custom assign PV inputs and setpoint
comparison types.
Table 108 Default PV sources and compare type operators
Stage Type PV_ON = PV_OFF =
Compare Operator
between
PV ON and SP ON
Compare Operator
between
PV OFF and SP OFF
Pressure / Flow
PV1* PV2* PV ON > SP ON* PV OFF> SP OFF*
Pump Down
PV1* PV1* PV ON > SP ON* PV OFF< SP OFF*
Pump Up
PV1* PV1* PV ON < SP ON* PV OFF> SP OFF*
User Configurable
PV1 or PV2 PV1 or PV2
Select from:
PV ON > SP ON
PV ON
≥ SP ON
PV ON < SP ON
PV ON
≤ SP ON
PV ON = SP ON
Select from:
PV OFF > SP OFF
PV OFF
≥ SP OFF
PV OFF < SP OFF
PV OFF
≤ SP OFF
PV OFF = SP OFF
*Default – cannot be changed

Honeywell HC900 Specifications

General

Series	HC900
Redundancy	Optional
Programming Language	Function Block Diagram, Ladder Logic, Structured Text
Inputs	Analog, Digital
Outputs	Analog, Digital, Relay
Display	Optional
Control	PID, Advanced Control
Power Supply	24V DC or 100-240V AC
Storage Temperature	-40°C to 85°C
Humidity	5% to 95% non-condensing
Communication Protocols	Modbus, Ethernet