Honeywell HC900 Reference Guide

Function Blocks
PID Function Block
290 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Example 4 - Ratio control
The RATIO control loop requires selection of the
remote SP of the PID for ratio control. The Ratio
and Bias values are available for adjustment
from the Control Setup screen of the Operator
Interface. The Bias may be a local value or come
from an external source such as an O2 analyzer
trim arrangement. You may elect to use % for
the ratioed inputs (typically for boiler
applications) or Eng. Units (EU) (for feed flows to
a reactor, for example).
External Bias
Input
Air (controlled variable)= Ratio x Fuel (RSP, or wild variable) + BIAS
Figure 74 Ratio control example

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