User Manual Owner's manual

188 Rockwell Automation Publication 280E-UM001B-EN-P – July 2012
Chapter 7 Bulletin 280E/281E/284E Programmable Parameters
How StepLogic Works
The StepLogic sequence begins with a valid start command. A normal sequence
always begins with 240 (StpLogic 0).
Digit 0: Logic For Next Step — This digit defines the logic for the next step, as
defined in Table13. When the condition is met the program advances to the next
step, Step 0 follows Step 7. For example, Digit 0 is set 3. program advances to next
step if Parameters 151…154 (Digital In x Sel), is set to Option 24 (Logic In2) and
becomes active.
Digit 1: Logic to Jump to a Different Step — For all settings other than F, when
the condition is met, the program overrides Digit 0 and jumps to the step defined
by Digit 2.
Digit 2: Different Step to Jump — When the condition for Digit 1 is met, the
Digit 2 setting determines the next step or to end the program, refer to Table26.
Digit 3: Step Settings — This digit defines what accel/decel profile the speed
command will follow and the direction of the command for the current step. In
addition, if a relay (Parameter 155) is set to Option 15 (StpLogic Out), this
parameter can control the status of that output.
Any StepLogic parameter can be programmed to control a relay, but you cannot
control different outputs based on the condition of different StepLogic
commands.
StepLogic Settings
The logic for each function is determined by the four digits for each StepLogic
parameter. The following is a listing of the available settings for each digit. Refer
to Appendix E for details.
Table 25 - Digit 0 and Digit 1 Settings
0
Skip Step (Jump Immediately)
1
Step Based on (StpLogic Time x)
2
Step if Logic In1 is Active
3
Step if Logic In2 is Active
4
Step if Logic In1 is Not Active
5
Step if Logic In2 is Not Active
6
Stop if either Logic In1 and Logic In2 is Active
7
Stop if both Logic In1 and Logic In2 is Active
8
Stop if neither Logic In1 and Logic In2 is Active
9
Step if Logic In1 is Active and Logic In2 is Not Active