Rockwell Automation 1794-VHSC 1794 FLEX I/O Very High Speed Counter Module User Manual User Manual
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Rockwell Automation Publication 1794-UM010D-EN-E - July 2013
Communicate With Your Module
Word 14
Bits 00…15
(00…17)
Channel 0 Scaler – This word scales the Z signal in period/rate and continuous/rate modes. If the filter is
applied, the filtered Z signal is scaled. Set only 1 bit of the Scaler.
Selecting a Scaler causes accumulated counts to be adjusted accordingly (for instance, selecting a Scaler of 128
increases the accumulated count by 128 after 128 Z pulses have been received).
We recommend using the filter to reduce erroneous frequency readings any time you use the Scaler on the
Z input.
00
Z
Fmins (frequency at which the 24-bit counter overflows) = 0.149 Hz
01
Z/2
Fmins (frequency at which the 24-bit counter overflows) = 0.298 Hz
02
Z/4
Fmins (frequency at which the 24-bit counter overflows) = 0.596 Hz
03
Z/8
Fmins (frequency at which the 24-bit counter overflows) = 1.192 Hz
04
Z/16
Fmins (frequency at which the 24-bit counter overflows) = 2.384 Hz
05
Z/32
Fmins (frequency at which the 24-bit counter overflows) = 4.768 Hz
06
Z/64
Fmins (frequency at which the 24-bit counter overflows) = 9.537 Hz
07
Z/128
Fmins (frequency at which the 24-bit counter overflows) = 19.073 Hz
Word 15
Bits 00…15
(00…17)
Channel 1 Scaler – This word scales the Z signal in period/rate and continuous/rate modes. If the filter is
applied, the filtered Z signal is scaled. Set only 1 bit of the Scaler.
Selecting a Scaler causes accumulated counts to be adjusted accordingly (for instance, selecting a Scaler of 128
increases the accumulated count by 128 after 128 Z pulses have been received).
We recommend using the filter to reduce erroneous frequency readings any time you use the Scaler on the
Z input.
00
Z
Fmins (frequency at which the 24-bit counter overflows) = 0.149 Hz
01
Z/2
Fmins (frequency at which the 24-bit counter overflows) = 0.298 Hz
02
Z/4
Fmins (frequency at which the 24-bit counter overflows) = 0.596 Hz
03
Z/8
Fmins (frequency at which the 24-bit counter overflows) = 1.192 Hz
04
Z/16
Fmins (frequency at which the 24-bit counter overflows) = 2.384 Hz
05
Z/32
Fmins (frequency at which the 24-bit counter overflows) = 4.768 Hz
06
Z/64
Fmins (frequency at which the 24-bit counter overflows) = 9.537 Hz
07
Z/128
Fmins (frequency at which the 24-bit counter overflows) = 19.073 Hz
Configuration Word Definition
Configuration
Word
Bit
Definition