Rockwell Automation 1769-HSC Compact High Speed Counter Module - Manual (Page 76)

76 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013
Chapter 4 Module Configuration, Output, and Input Data
Program Mode and Program State Run
Program Mode (Out0ProgramMode through Out3ProgramMode)
The program mode bits configure the output for Hold Last State (HLS) or
User-defined Safe State (UDSS) during Program State.
• 1 = Hold Last State
• 0 = User-defined Safe State
Program State Run (Out0ProgramStateRun through Out3ProgramStateRun)
Program State Run lets you specify, on a bit basis, that the output should
continue to be controlled by the module as if it were in the Run state. That is,
events on the module or changes in the output image will affect the physical
outputs without regard to the Program_HLS or UDSS state indicated. When
this bit is set, the corresponding Program Mode and Program Value bits are
ignored.
IMPORTANT Do not set these bits while certain counters or ranges are enabled.
Attempting to do so will result in a BadModConfigUpdate error. See
page 120 for a list of prohibited settings.
Configuration Array Word 2 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Output Program Mode and
Output Program State Run Not used Out3
PSR Out2
PSR Out1
PSR Out0
PSR Out3
PM Out2
PM Out1
PM Out0
PM
IMPORTANT Program Mode and Program State Run apply only to certain controllers.
Refer to your controller’s documentation for more information.
The packaged controllers’ embedded HSC does not support this feature.
ATTENTION: Selecting this option lets outputs change state while ladder
logic is not running. You must take care to make sure that this does not
pose a risk of injury or equipment damage when selecting this option.
IMPORTANT The prescan initiated by some controllers could have an effect on the
outputs. To overcome any changes in physical output states caused by
this, retentive output instructions (for example, latch or unlatch) should
be used when bit manipulations are done on the Output image of this
module in ladder logic.
This applies to a wide range of bits when Program State Run is selected,
because presetting a counter, enabling a range, changing a mask, and
changing configuration array settings can cause ranges and outputs to
change state.