Rockwell-automation 1734-VHSC24 Very High-Speed Counter Modules User M Manual de usuario descargar pdf (Pagina 37)

Publication 1734-UM003B-EN-P - August 2000

Very High-Speed Counter Module Input and Output Data 3-7

Filter Selection (Configuration Word 2)

This byte sets the A/B/Z input filters.

Filter Selection

Decimal Position (Configuration Word 3)

This byte changes the significant digits of the frequency or counter

display.

In the frequency modes (period/rate [5], continuous/rate [6], rate

measurement [7]) for example, a -2 moves the decimal point left 2

places, dividing the frequency value by 100, a +1 moves it right,

multiplying by 10. The firmware checks for placement to be in the

range -4 ≤ value ≤ +2. A value outside the range moves the decimal

point to the zero position and asserts the programming error (PE) bit.

Moving the decimal point to the left (negative), allows high

frequencies, commonly present in rate measurement mode, to fit

within a single 16-bit word. Moving the decimal point to the right

(positive), allows low frequencies, commonly present in period and

continuous rate modes, to have resolution displayed to 0.1 Hz and

0.01 Hz. Keep frequencies below 3.2 kHz for 0.1 Hz resolution and

below 320 Hz for 0.01 Hz. Scalars of Z/128, Z/64, Z/32, and Z/16

should not be used when positioning is applied. 0 is the default

setting.

07 06 05 04 03 02 01 00

0ZFBFAF FS

0000No Filter

000150 kHz (10 µs + 0 µs/-1.6 µs)

00105 kHz (100 µs + 0 µs/-13.2 µs)

0100500 Hz (1.0 ms + 0 µs/-125 µs)

100050 Hz (10 ms + 0 ms/-1.25 ms)

0 A input not filtered

1 A input filtered

0 B input not filtered

1 B input filtered

0 Z input not filtered

1 Z input filtered

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 73 74

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Rockwell-automation 1734-VHSC24 Very High-Speed Counter Modules User M Manual de usuario Pagina 37