Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 365)

7.1 Basic Flow of Troubleshooting
7-2
7.1 Basic Flow of Troubleshooting
When a problem occurs, it is important to quickly find the cause of the problem and get the system running again as
quickly as possible. The basic troubleshooting flow is illustrated below.
Step 1 Visually confirm the following items.
• Machine movement
• Power supply
• I/O device status
• Wiring status
• Indicator status (LED indicators on each Module)
• Switch settings (e.g., DIP switches)
• Parameter settings and program contents
Step 2
Monitor the system to see if the problem changes in
response to the following operations.
• Switching the Controller to STOP status
• Resetting alarms
• Turning the power supply OFF and ON again
Step 3
Determine the location of the cause from the results of
steps 1 and 2.
• Controller or external?
• Sequence control or motion control?
• Software or hardware?