Rockwell-automation 1794-IP4 Series B FLEX I/O PULSE COUNTER User Manu Manual do Utilizador descarregar pdf (Página 15)

1–5Overview of the Pulse Counter Module

*!)$# .  **() 

Start Period Time Measurement

The control bit StartMeasurement starts the measurement of the time

period.

 Function

 '$ )" "(*'"#) ()$%% #$) #!

 '$ )" "(*'"#) ()')( $# ) %$()+  $ )

+'!

Check if the Measurement is Complete

After a complete measurement the flag MeasurementReady is set.

 Function

  "(*'"#) ( #$) $"%!)

  %$()+  $ ) ! #)( )) ) "(*'"#) (

$"%!)

MeasurementReady is reset by the module when a positive edge of

StartMeasurement is received.

Select Clock Frequency

The clock period for the period time measurement resolution

selection can be set to 1 or 10MHz using the variable

ClockFrequency. 10MHz clock frequency is recommended at 32–bit

period time measurement to provide the best accuracy and

resolution. Use 1mHz clock frequency at 16–bit frequencies to avoid

overflow in the counter at frequencies over 15Hz.

 Function

 !$ '&*#,  -

 !$ '&*#,  -

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Rockwell-automation 1794-IP4 Series B FLEX I/O PULSE COUNTER User Manu Manual do Utilizador Página 15