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
Bit/Word Definitions
Output
Word
Bit
Definition
Word 0
00…15
(00…17)
Counter Control Word
00
Channel 0 Counter reset bit (CR) – A 0 to 1 transition of this bit
clears the counter. Outputs are adjusted according to the window
compare values.
01
Channel 0 Counter preset bit (CP) – A 0 to 1 transition of this bit sets
the counter to the value specified by the preset words. Outputs are
adjusted according to the window compare values.
02
Channel 0 Value reset bit (VR) – A 0 to 1 transition of this bit clears
the stored/accumulated count words.
03
This bit is always 0.
04
Channel 1 Counter reset bit (CR) – A 0 to 1 transition of this bit
clears the counter. Outputs are adjusted according to the window
compare values.
05
Channel 1 Counter preset bit (CP) – A 0 to 1 transition of this bit sets
the counter to the value specified by the preset words. Outputs are
adjusted according to the window compare values.
06
Channel 1 Value reset bit (VR) – A 0 to 1 transition of this bit clears
the stored/accumulated count words.
07
This bit is always 0.
08…10
(10…12)
Reserved for factory use.
11 (13)
Frequency/Resolution enhancement bit (M11) Set this bit to 1 for
frequency precision configuration (Refer to
for details on frequency precision configuration).
Note: You must place a value between -4 and +2 in output word 2 and/
or 3 to shift the decimal position accordingly.
12…15
(14…17)
Reserved for factory use.
Word 1
00…15
(00…17)
Output Control Word
00
Output 0 Force output bit (FO) – When set to 1, output is turned on if
OE is 1. When FO = 0, output can be controlled by a compare match or
as directed by the PWM settings.
01
Output 0 Output enable bit (OE) – When set to 1, output can be
turned on from a force on, compare match or as directed by the PWM
settings. When OE = 0, the associated output is turned off.