Safety Logic Circuit alarm - line 129!?!?

When an alarm displays on the teach pendant and refers to line 129 (or greater) it can be confusing.  The (typical) safety logic circuit only contains 128 lines of possible logic.  This alarm can be confusing.  When the line number in brackets displays greater than 128, then the issue is actually in the SYSTEM portion of the safety logic circuit.

There are two alarms which happen at different times related to this issue:

• You can get one alarm on the YRC1000 Pendant at boot up
• Alarm 4197
• INCORRECT SAFETY LOGIC CIRCUIT
  [129]

• You can also get this alarm when loading a new YSFLOGIC.DAT and trying to compile/load it:
• Alarm 4241
• Safety logic circuit is not set correctly.
  [129]

Advanced users of the Yaskawa pendant will be aware that # in brackets in the alarm text refers to the line #.  But since the safety logic circuit is limited to 128 lines it has been a point of confusion.  The error is in the SYSTEM side of the safety logic circuit. 

In this particular instance the error was that the an XOUT Feedback (EDM setting) was changed in in Maintenance Mode making the contact / variable unavailable.  In particular the software didn’t like the use of “#1 S-XEDM07” and “#1 S-XEDM08” in the file installed or being loaded until those settings were corrected and the controller was rebooted.