Detailed description of data table information, Present channel data (input word 1), Stored/accumulated channel data (input word 2) – Rockwell Automation 1734-VHSC24 Very High-Speed Counter Modules User Manual User Manual

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Publication 1734-UM003B-EN-P - August 2000

3-2 Very High-Speed Counter Module Input and Output Data

Detailed Description of
Data Table Information

Present Channel Data (Input Word 1)

This is a 32-bit unsigned long-word value representing the current
count of the 24-bit counter (configurations: count [0], x1 encoder [1],
x2 encoder [2], PWM [3], x4 encoder [4]) or the frequency
(configurations: period/rate [5], continuous/rate [6], rate measurement
[7]). The range of values is 0

≤ value ≤ 0x00FFFFFF (16,777,215).

Stored/Accumulated Channel Data (Input Word 2)

This is a 32-bit unsigned long-word value representing the stored
count of the counter at the time of some specified event. In counter
configurations (configurations: count [0], x1 encoder [1], x2 encoder
[2], x4 encoder [4]) without store modes selected, these words are not
updated. With store modes selected, they are the stored value of the
counter at the time of the specified event (for example, rising edge of
Z input). In PWM [3] configuration it is the counter value at the end of
the period specified by the product of the time base x gate interval. In
period/rate [5] and continuous/rate [6] configurations it is the total
accumulation of unscaled Z pulses (for example, if scaling is set to
128, after 128 Z pulses the accumulator increases by 128 counts).

The maximum frequency that accumulation can follow in these two
modes is 200 Hz x scalar value (for example, 200 Hz x 128 is 25 kHz).

Scalar

8-bit value used to divide the Z input by 2

Output Ties 0

Output Ties 1

Rollover Value

32-bit value at which the counter is commanded to rollover

Preset Value

32-bit value the counter is to be set to when CP is asserted

On Value 1