Rockwell Automation 1734-VHSC24 Very High-Speed Counter Modules User Manual - Manual (Page 38)

Publication 1734-UM003B-EN-P - August 2000
3-8 Very High-Speed Counter Module Input and Output Data
In the counter modes (counter [0], x1 encoder [1], x2 encoder [2], pwm
[3], x4 encoder [4]), it attenuates the counter display, for example, 20
divides count+1 by 20. The value may be in the range 0 < value
≤ 255.
The result of requesting a number other than 1 performs the function:
(COUNT + 1) / ATTENUATION. This is useful for scaling a large
counter value to a smaller 16-bit value or a percentage. 1 is the default
setting and zero reverts to 1 to prevent a divide by zero.
Active Output Assembly (Configuration Word 4)
This byte permits selection of either assembly 105 (0x69 - Counter/
Output Control) or 106 (0x6A - PWM Value) for poll consumption.
Entering a zero causes the default assembly, 105, to be selected.
Time Base/Pulse Width Modulation (PWM) Period
(Configuration Word 5)
This word sets the fundamental time base for the counter. Its
resolution is in milliseconds with minimum 10 ms intervals (an interval
of 10 milliseconds is a value of 10, 1 second is 1000). The maximum
value that may be programmed is 3 seconds (3000). The time base
must be entered when the PWM [3] and rate measurement [7]
configurations are used.
Gate Interval (Configuration Word 6)
This byte sets the counter’s gate interval using the time base setting as
its time unit. Its resolution is determined by the time base. The actual
gate interval is the product of the time base and the gate interval (for
example, 50 ms gate interval may be produced with a time base of 10
and a gate interval of 5 or a time base of 50 and a gate interval of 1).
The maximum value of the product of time base x gate interval is 3
seconds. The gate interval must be entered when the PWM [3] and
rate measurement [7] configurations are used. The maximum value is
200.