Rockwell-automation 1756-HSC ControlLogix High Speed Counter Module Manual de usuario descargar pdf (Pagina 12)

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

12 1756-HSC Module Features

This user manual also details the Frequency operational modes that are

available depending on which one is required for your application. Frequency

can be calculated in one of three ways:

• frequency (rate measurement).

•period rate.

• continuous rate.

All three Frequency modes determine the frequency of input pulses by

counting pulses over a user-defined time interval. If the revolution is spinning

in a clockwise direction, the frequency is positive; in a counterclockwise

direction it’s decreasing (negative) frequency.

See

page 29

for more details on Frequency modes.

Pulse counts and frequency values are stored in one of three input tags (based

on the mode) as shown in the table.

See

1756-HSC Data Structures

in Appendix C for a list of tags.

Mode and Input Tag Values for the 1756-HSC/B Module

Comm Format = HSC Data-extended Tags

Mode Mode Description Present Value Stored Value Totalizer

0 Counter

Accumulated count Stored value

Directional frequency

(2)

1 Encoder X1

2 Encoder X4

3 Counter Not Used N/A N/A N/A

4 Frequency

(Rate Measurement)

(1)

No. of input pulses occurring

in sample period

Frequency

Accumulated count

(3)

5 Frequency

(Period Rate)

(1)

No. of 4 MHz pulses

occurring in sample period

Accumulated count

6 Frequency

(Continuous Rate)

(1)

Modes where frequency controls the outputs.

(2)

B-input state defines direction (Counter mode).

(3)

Rollover/Preset settings apply.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 127 128

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Rockwell-automation 1756-HSC ControlLogix High Speed Counter Module Manual de usuario Pagina 12

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