GE PACSystems RX7i User Manual

Chapter 4. Ladder Diagram (LD) Programming
136 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C
4.7.3 Up Counter
The Up Counter (UPCTR) function counts up to the Preset Value (PV). The range is 0 to +32,767
counts. When the Current Value (CV) of the counter reaches 32,767, it remains there until reset.
When the UPCTR reset is ON, CV resets to 0. Each time the power flow input transitions from OFF to
ON, CV increments by 1. CV can be incremented past the Preset Value (PV). The output is ON
whenever CV  PV. The output (Q) stays ON until the R input receives power flow to reset CV to zero.
The state of UPCTR is retentive on power failure; no automatic initialization occurs at power-up.
Warning
Do not use the Address of the up counter with other
instructions. Overlapping references cause erratic
counter operation.
Operands
Parameter
Description
Allowed
Operands
Optional
Address
(???? )
The beginning address of a three-word WORD array:
Word 1: Current Value (CV)
Word 2: Preset Value (PV)
Word 3: Control word
R, W, P, L, symbolic
No
R
When R is ON, it resets the counter's CV to 0.
Power flow
No
PV
Preset Value to copy into word 2 of the counter's address when the
counter is enabled or reset. 0  PV  32,767. If PV is out of range, it
does not affect word 2.
All except S, SA, SB,
and SC
No
CV
The current value of the counter
All except S, SA, SB,
SC and constant
No
Example – Up Counter
Every time input %I0012 transitions from OFF to ON, the Up Counter counts up by 1; internal coil
%M0001 is energized whenever 100 parts have been counted. Whenever %M0001 is ON, the
accumulated count is reset to zero.

GE PACSystems RX7i Specifications

General

Brand	GE
Model	PACSystems RX7i
Category	Controller
Language	English