Honeywell HC900 Reference Manual page 58

Function Blocks
AI Function Block
Parameter Index #
6
High Range
Value
7
Low Range
Value
8
Disable
Channel
Output Value
2
Filter Time
(sec)
3
Bias
N/A
Failsafe Use
Value
4
Failsafe Use
Value field
N/A
Downscale
Upscale
N/A
Burnout
Check
N/A
Bad Channel
Detection
44
Parameter Description
For Linear Inputs Only - output value
that corresponds to 100% input value.
For example:
Actuation Input = 4-20mA
Process variable = Flow
Range of Flow = 0 to 250 gal/min
High Range Display Value = 250
Low range Display Value = 0
Then 20mA = 250, 4mA = 0
For Linear Inputs Only - output value
that corresponds to 0 % input value
For example: See "High Range
Value".
The output value when the AI channel
is disabled. Disable = ON
A software digital filter is provided for
the input designated to smooth the
input. You can configure the first
order lag time constant from 1 to 120
seconds. 0=no filter
Bias is used to compensate the input
for drift of an input value due to
deterioration of a sensor, or some
other cause.
Use the User value entered in the
appropriate field.
The output value to which the output
will go to protect against the effects of
failure of the equipment, such as, fuel
shut-off if there is loss of flame in a
furnace, or a sensor break.
LINEAR
OUT = Value set at "Low range value"
field.
T/C or RTD
OUT = Value of Low range implied by
input type.
LINEAR
OUT = Value set at "High range
value" field.
T/C or RTD
OUT = Value of High range implied by
input type.
Burnout check enable
(Thermocouples only)
Check this to generate a hardware
failure diagnostic if a bad AI channel
is detected. If unchecked, a
diagnostic will not be generated,
which may be desirable for inputs
used for monitoring only.
HC900 Hybrid Control Designer Function Block Reference Guide
Value or Selection
Enter a value:
± 99999 to ± 99999
Enter a value:
± 99999 to ± 99999
Enter a value
Default = 0
Enter a value:
0 to 120 seconds
Enter a value:
±9999 to ±99999
Click on Radio
button to select
Enter a value in
Engineering Units
±9999 to ±99999
Click on Radio
button to select
Click on Radio
button to select
Click on block to
select or deselect
Click on block to
select or deselect
Revision 11
2/07