Function Blocks
CARB Carbon Potential Function Block
100 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Table 29 CARB General tab configuration parameters
Properties Group Parameter Index # Parameter Description Value or Selection
Block Order
N/A Execution Order Read Only. To change block
order, right-click on a Function
Block and select Execution
Order.
Tag Name
16 character tag name
Descriptor
Block Descriptor
Control Algorithm
N/A Control Algorithm
Note: In PID B, step
changes in setpoint will
not bump the output; the
output will slew smoothly
to the new value.
In PID A, a step change in
setpoint will result in a
step change in output.
PID A - is normally used for 3
mode control. The output can be
adjusted somewhere between
100 % and 0 %. It applies all
three control actions -
Proportional (P), Integral (I), and
Derivative (D) - to the error
signal.
PID B - Unlike the PID-A
equation, the controller gives
only an integral response to a
setpoint change, with no effect
on the output due to the Gain or
Rate action, and gives full
response to PV changes.
DUPA - like PIDA but provides
an automatic method to switch
tuning constant sets for
Heat/Cool applications.
DUPB - like PIDB but provides
an automatic method to switch
tuning constant sets for
Heat/Cool applications.
NOTE: With PID B or DUPB
selection, you will not be
allowed to set RESET or RPM
to 0.00 (OFF). Reset must be
enabled.
Direction
N/A Control Action
DIRECT - PID action causes
output to increase as process
variable increases.
REVERSE - PID action causes
output to decrease as process
variable increases.
SP Tracking
N/A Setpoint Tracking
NONE
TRACK PV When control mode
is “manual”, local setpoint tracks
process variable.
TRACK RSP When setpoint is
“remote setpoint”, local setpoint
tracks remote setpoint.
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