Fagor alarm 4216: Error in the Sercos ring (synchronism)

What it means

General synchronism loss on the Sercos bus: nodes no longer agree on the cycle timing and phase 4 drops. The manual attributes it to connection problems, parameterization issues or Sercos-board problems, and recommends verifying the whole ring before contacting service.

Likely causes

• fiber optic path degraded anywhere in the loop
• timing/telegram parameterization mismatch
• Sercos interface board failing under temperature

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• SERCOS fiber-optic ring cable assembly

  cable · Common cause

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