Honeywell HC900 Reference Guide

Function Blocks
CARB Carbon Potential Function Block
116 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Example
HFigure 22 shows Function Block Diagrams using a CARB function block.
Carbon Potential Probe Burn-off
Application:
To clean a carbon probe periodically
by blowing air across it for a specific
time.
In this configuration, a periodic timer
generates a pulse a designated time
interval which suspends automatic
control and energizes a relay output
to cause air flow for a probe burn off
cycle. Timers determine the probe
burn-off period and allow time for
the probe recovery before returning
the loop to automatic control.
PTMR Output
MDSW Output
Burnoff Time
Time Delay to AUTO
Manual
Auto Auto
Off delay #1
Off delay #2
Configuration Notes:
Select probe Mfg.. type
O2 probe input: 0 to 2 V.
(0 to 2000 range)
Select T/C type J or K etc..
Timing Diagram
Figure 22 CARB function block examples

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