IB-S-420

WARN 0A20: 1st Seg. Unswitchable

The first physical InterBus device cannot be disabled.

None

Applicable equipment

Source: Fault JSON · FANUC_R30iB_全部故障码_中英双语.json · SHA-256 3eef897f540467130587726e7a53e338980cbb19f10ad88a4eddbec837fb0f55 · IB-S-420

Brand	FANUC
Updated	2026-10-26

IB-S-420

The first physical InterBus device cannot be disabled.

None

Applicable equipment

Source: Fault JSON · FANUC_R30iB_全部故障码_中英双语.json · SHA-256 3eef897f540467130587726e7a53e338980cbb19f10ad88a4eddbec837fb0f55 · IB-S-420

Brand	FANUC
Updated	2026-10-26