Honeywell HC900 - Table 79 PID General Tab Configuration Parameters

Function Blocks
PID Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 273
2/07
Table 79 PID 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
N/A 16 character tag name
Descriptor
N/A 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 PID A but provides an
automatic method to switch tuning
constant sets for Heat/Cool applications.
DUPB - like PID B 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.