Function Blocks
PI Pulse Input
264 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Hints
If it is necessary to turn off a device when the pulse counter is placed in HOLD, it is recommended that you
also tie the source of the input HOLD signal to a DO block. The DO block would then control the On/off
State of the device.
Configuration Parameters
Table 77 Pulse Input Configuration Parameters
Properties Group Parameter Index # Description Value or Selection
Block Order N/A
Execution Order for
Block.
Read Only. To change
block order, right-click on a
Function Block and select
Execution Order.
Address Rack 0
This is the rack
address of the PFQ
module.
Enter a value: from 1 to 5.
Module 0
Module address of
the PFQ module.
Enter a value: from 1 to
12.
Channel 0
Channel on selected
Module.
Enter a value: from 1 to 4
Pulse Weight Pulses per EU 1
Example: if
measuring gallons
and if 100 pulses = 1
gallon, enter 100.
Rate Sample Time 5
The output RATE is
calculated by
counting number of
pulses per Sample
Time and scaling it to
EU/Time Period.
Sample Time is a
rolling window of
time (updated each
scan cycle) used to
count pulses. The
longer the Sample
Time the smoother
the rate output and
the longer it will take
to change; the
smaller the Sample
Time the noisier the
rate output but the
quicker the
response.
Enter 0-60 seconds using
0.5 sec. intervals.
Time Period 6
Time unit used to
scale the rate from
pulses per Sample
Time to:
EU per Second, or
Select Per Second, Per
Minute, Per Hour
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