Hi everyone,
I’m running into a peculiar issue with our FANUC robot (R-30iB controller). We recently had a persistent “Fence Open” alarm. Based on advice found in several threads and from some colleagues, we jumped the fence cables to bypass the fence safety circuit—this successfully got rid of the Fence Open error.
However, now we’re facing a new problem: our robot program keeps aborting mid-cycle, and it doesn’t throw any error messages at all. The Teach Pendant just shows that the program is no longer running, but no alarm codes are displayed. It’s as if someone just hit the “Abort” button, but nobody did.
Here’s what we’ve checked so far:
- Connections: We confirmed our jumpers and all relevant safety connections are secured. Everything appears correct and stable.
- System Variables: We looked at some of the system variables to ensure nothing was inadvertently changed that could cause an automatic abort (like motion group configurations or skip signals). No red flags.
- IO Signals: We verified if any I/O signals might inadvertently be sending an abort request (e.g., external E-stop, user alarms, or safety signals). Nothing stands out.
- Program Logic: We stepped through the program logic, but didn’t see any instructions that might cause an unprompted abort.
At this point, we’re somewhat stuck. Has anyone seen a FANUC program abort without logging an error? Are there any hidden logs or diagnostic menus we should investigate further? Could bypassing the fence circuit in this manner be triggering some safety logic we’re overlooking?
Any insight, suggestions, or experiences with a similar situation would be much appreciated. Thanks in advance!
Robot/Controller Info
- Robot Model: FANUC SR-6iA
- Controller: R-30iB
Symptoms
- Program aborts suddenly without any error displayed
- Fence Open issue was resolved by jumping cables as recommended
Troubleshooting Steps Taken
- Checked safety circuits and jumpers
- Verified system variables
- Inspected I/O assignments
- Reviewed program logic for hidden abort commands
Looking forward to any advice or solutions you may have. Thank you!
