KUKA Error 1556 — SINEC L2 BUS CHANNEL NOT OPEN
InfoDisplayed as KSS01556 on KRC4 / KRC5 controllers
KUKA 1556 (“SINEC L2 BUS CHANNEL NOT OPEN”): An attempt was made to open a SINEC L2 connection without first opening the SINEC L2 bus channel. First check: Open the SINEC L2 bus channel.
Updated 2026-09-09 · LogrobotLM reference
Cause
An attempt was made to open a SINEC L2 connection without first opening the SINEC L2 bus channel.
Effect
None.
Troubleshooting
Open the SINEC L2 bus channel.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →