Rockwell Automation 1734-VHSC24 Very High-Speed Counter Modules User Manual - Manual (Page 35)

Publication 1734-UM003B-EN-P - August 2000
Very High-Speed Counter Module Input and Output Data 3-5
Output Data Counter Control (Word 1)
VR Value Reset of stored/accumulated count. The transition of this
bit from 0 to 1 clears the stored/accumulated count word.
CP Counter Preset. The transition of this bit from 0 to 1 sets the
counter to the value specified by the Preset words. Outputs
are adjusted according to the window compare values.
CR Counter Reset. The transition of this bit from 0 to 1 clears the
counter. Outputs are adjusted according to the window com-
pare values.
Output Control (Word 2)
Diagnostic speed (DS) - When this bit is set (1), the short circuit and
open wire diagnostics are filtered (50 ms) to prevent nuisance trips
caused by noisy environments. When the bit is reset (0), diagnostics
responds to a fault condition in less than 8 ms.Bits 7 and 3 report
output 1 and 0, respectively.
Electronic-fuse Select (ES) - When this bit is set (1), outputs are
disabled upon the detection of a fault (short circuit or open wire) and
the output fault status indicator, FS, is latched. Recovery from a faulted
state is achieved by sending ES = 0 and OE = 1 for the afflicted output.
When ES equals zero, a faulted output continues to operate as
instructed until the fault is removed. In either case, FS is asserted to
indicate a fault. Bits 6 and 2 report output 1 and 0 respectively.
Output Enable (OE) - When this bit is set (1), outputs are permitted
to turn on from either a force on, FO, a compare match or as directed
by the PWM settings. When OE equals zero, the module turns the
associated output OFF. Bits 5 and 1 represent outputs 1 and 0
respectively.
Force Output (FO) - When this bit is set to 1, outputs are turned on if
OE is 1. When FO equals zero, outputs may then be controlled by a
compare match or as directed by the PWM settings. Bits 4 and 0
represent outputs 1 and 0 respectively.