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KUKA Error 1540 — INTERRUPT STRUCTURE OVERFLOW

Error

Displayed as KSS01540 on KRC4 / KRC5 controllers

KUKA 1540 (“INTERRUPT STRUCTURE OVERFLOW”): At controller level and robot level, more than 16 "slow" variables in total have been used in the logical expressions of the INTERRUPT DECL commands. First check: Use fewer predefined variables.

Updated 2026-09-09 · LogrobotLM reference

Cause

At controller level and robot level, more than 16 "slow" variables in total have been used in the logical expressions of the INTERRUPT DECL commands.

Effect

Stop via braking ramp. All active commands are inhibited.

Troubleshooting

Use fewer predefined variables. If necessary, combine expressions with CYCFLAGS.

Related codes

1541INCORRECT MACHINE DATA1537STOP DUE TO LOADING OF NEW USER DATA1543ALL CYCLICAL ANALOG INPUTS IN USE1536INCORRECT ARRAY PARAMETER

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