Rockwell Automation 1794-VHSC 1794 FLEX I/O Very High Speed Counter Module User Manual - Manual (Page 52)

44 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