PCC-IV Instruction Manual (Rev. 0.1)
Page 6-6
Section 6
– Blockware Functions
Technical Reference
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NAME: RAIN SINGLE USE FUNCTION: N OUTPUT TYPE: A
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No Inputs
Parameter Description Default Max Min Code Notes
_____________________________________________________________________________________________
1 MIN OUTPUT 0.00 199.99 -199.99 2 1
2 MAX OUTPUT 100.00 199.99 -199.99 2 1
3 %/SEC RATE LIMITER (100=OFF) 100.00 100.00 0.10 2 2
4 FILTER SECONDS 0.00 3.00 0.00 2 x
5 COMM FAIL DELAY SEC. 5 3600 1 2 x
6 FAIL ACTION, 0=LAST, 1=DEFAULT 0 1 0 2 x
7 FAIL DEFAULT 0.00 199.99 -199.99 2 x
Notes:
1. MIN must be less than MAX.
2. 100.00%/sec rate limit turns off Rate Limiting
F11
[DUAL] Dual Range Flow Transmitter Selector-Scaler
Function
DUAL
is used to automatically select and scale one of two flow transmitters in a dual range arrangement.
This allows greater measurement accuracy over a wider flow range.
Example: An orifice plate with two differential pressure transmitters piped in parallel. The High range transmitter is
calibrated 0-
100” WC, the Low range transmitter is calibrated 0-9” WC. The
DUAL
Block should be set to a 9%
switch point, with the square root option selected (the transmitters should NOT have internal square root selected).
From 100” – 9” WC, the High Range Input would be selected, square rooted, and sent to the
DUAL
Block Output
as a 100-30% signal. Below 9
” WC, the Low range would be selected, the transmitter signal would be scaled, square
rooted, and sent to the
DUAL
Block Output as a 30-0% signal.
Formula (shown with optional square root being taken):
If High Range Input greater than Switch Point:
Output = 10 * square root [High Range Input]
Else
Output = 10 * square root [(Low Range Input * Switch Point) / 100]
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NAME: DUAL SINGLE USE FUNCTION: N OUTPUT TYPE: A
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Input Type Description Notes
_____________________________________________________________________________________________
1 A HI RANGE INPUT
2 A LOW RANGE INPUT 1
Parameter Description Default Max Min Code Notes
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1 SWITCHING POINT (% OF HIGH
RANGE 10.00 50.00 1.00 2 2
2 SQUARE ROOT? 0=NO 1=YES 1 1 0 2
Notes:
1. Low Range Input MUST be scaled to match the Switch Point and the High Range transmitter.
Example: High Range transmitter is 0-
120” WC for 4
-20 mA, or 0-100% inside the PCC-IV, If
the Switch point is 10%, the Low range transmitter MUST be calibrated 0
–12.0” wc for 0
-
100%.
2. Percent of High Range Input.
