GE 90-30/20/Micro UPCTR

4-20 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K

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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.

RWhen 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.

QOutput Q is energized when the current value is greater than or equal to the

preset value.