User Manual Owner's manual

338 Rockwell Automation Publication 280E-UM001B-EN-P – July 2012
Appendix E StepLogic, Basic Logic and Timer/ Counter Functions
Timer Function
Digital inputs and outputs control the timer function and are configured with
Parameters 151…154 (Digital In x Sel) set to Option 18 (Timer Start) and
Option 20 (Reset Timer).
Digital outputs (relay) define a preset level and indicate when the level is reached.
Level Parameter 156 (Relay Out Level) is used to set the desired time in seconds.
Parameter 155 (Relay Out Sel) is set to Option 16 (Timer Out) and causes the
output to change state when the preset level is reached.
Counter Function
Digital inputs and outputs control the counter function and are configured with
Parameters 151…154 (Digital In x Sel) set to Option 19 (Counter In) and
Option 21 (Reset Counter).
Digital outputs (relay) define a preset level and indicate when the level is reached.
Level Parameters 156 (Relay Out Level) is used to set the desired count value.
Parameter 155 (Relay Out Sel) is set to Option 17 (Counter Out) which causes
the output to change state when the level is reached.
Example
• A photo eye is used to count packages on a conveyor line
• An accumulator holds the packages until five are collected
• A diverter arm redirects the group of five packages to a bundling area
• The diverter arm returns to its original position and triggers a limit switch
that resets the counter
• parameters are set to the following options:
– Parameter 151 (Digital In 1 Sel) set to Option 19 to select (Counter In)
– Parameter 152 (Digital In 2 Sel) set to Option 21 to select (Reset
Counter)
– Parameter 155 (Relay Out Sel) set to Option 17 to select (Counter
Out)
– Parameter 156 (Relay Out Level) set to 5.0 (counts)