Publication 2098-IN005C-EN-P — March 2008
166 Minimizing the Effects of Feedback Signal Loss
Visualize the New Position Error Limit
Follow these steps to visualize the new position error limit.
1. Set the Logix processor to online operation.
2. Download the program to the controller when prompted.
3. Right-click the Start bit in your program and choose Toggle Bit.
4. Click Run and observe the trending dialog.
No waveform (no trigger events) indicates the new position error
limit threshold is not exceeded.
The new Position Error Tolerance limit settings are verified when no
trigger events occur in the application under normal operating
conditions. If trigger events occur, it is likely that the excursion limit
values are not properly captured and need to be determined again.
Repeat the excursion limit extraction process and assure that absolute
(global) positive and negative excursion limit values are captured.
Additional Methods
It is good practice to make sure that your application can maintain the
physical speed and position limits of the overall system. Use these
additional safety measures to guard against unexpected motion.
• Hardware over-travel protection
• Dynamic braking circuit
• Bulletin 2090 resistive brake module (RBM)
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