Function Blocks
CARB Carbon Potential Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 97
2/07
CARB Carbon Potential Function Block
Description
The CARB label stands for Carbon Potential...
This block is part of the
Loops category
Function
A combined Carbon Probe and Temperature Probe and PID algorithm determine Carbon Potential of
furnace atmospheres based on a Zirconia probe input.
Input
Probe =
Sensor Input from AI block (0-2000 mV)
TEMP = Temperature Input (°F or °C) from AI block
%CO = Percent Carbon Monoxide 1 % to 100 %
RSP = Remote Setpoint Analog Input value in Engineering Units or Percentage (0-1.5)
FFV = Feedforward value in percentage (0 % to 100 %) The Feedforward value is multiplied by the
Feedforward Gain, then directly summed into the output of the PID block.
TRV = Output Track value in Percentage. Output = TRV when TRC is on. (If control output OUT is
connected back to the Track Value Input [TRV], then the Track Command Input [TRC] will function as an
output hold. This may be used where input probes are undergoing burnoff.)
TRC = Output Track Command [ON, OFF] On – Enables TRV (Mode = Local Override)
BIAS = Remote Bias value for Ratio PID
SWI = Switch Inputs (from LPSW function block)
0 = No Change
1 = Initiate Autotuning
2 = Change Control Action (reverse to direct acting or direct to reverse acting)
4 = Force Bumpless Transfer
8 = Switch to Tune Set 1
16 = Switch to Tune Set 2
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