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4-20 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
4
UPCTR
The Up Counter (UPCTR) function is used to count up to a designated value. The range is 0 to
+32,767 counts. When the up counter reset is ON, the current value of the counter is reset to 0.
Each time the enable input transitions from OFF to ON, the current value is incremented by 1. The
current value can be incremented past the preset value PV. The output is ON whenever the current
value is greater than or equal to the preset value.
The state of the UPCTR is retentive on power failure; no automatic initialization occurs at power-
up.
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(enable) >|UPCTR|— (Q)
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(reset) —|R |
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(preset value) —|PV |
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|_____|
(address)
Parameters:
Parameter Description
address The UPCTR uses three consecutive words (registers) of %R memory to store the
following:
• Current value (CV) = word 1.
• Preset value (PV) = word 2.
• Control word = word 3.
When you enter an UPCTR, you must enter an address for the location of these
three consecutive words (registers) directly below the graphic representing the
function.
Note: Do not use this address with another up counter, down counter, or any other
instruction or improper operation will result.
Caution: Overlapping references will result in erratic operation of the counter.
enable On a positive transition of enable, the current count is incremented by one.
R When R receives power flow, it resets the current value back to zero.
PV PV is the value to copy into the counter’s preset value when the counter is enabled
or reset.
Q Output Q is energized when the current value is greater than or equal to the
preset value.