Applicable Systems
LR Mate 200iD
M-710iC
M-20iA
M-1iA
R-2000iC
Symptoms
FANUC Serial Servo Bus (FSSB) communication between controller and servo amplifier lost; all axes stop.
Possible Causes
- FSSB cable disconnected or damaged
- Servo amplifier internal communication fault
- Controller servo board failure
Troubleshooting Steps
- Step 1: Check FSSB cable connections at controller and amplifier
All connections seated - Step 2: Inspect FSSB cable for damage
Cable intact - Step 3: Check servo amplifier power and status LEDs
Amplifier powered, LEDs normal - Step 4: Replace FSSB cable if damaged
New cable communicates - Step 5: If amplifier fault, replace servo amplifier
New amplifier communicates via FSSB
How to Reset
Reset via teach pendant; requires amplifier reinitialization if replaced.
Common Replacement Parts
- FSSB Communication Cable
- Servo Amplifier (Fanuc Alpha Series)
Frequently Asked Questions
- Q: What is FSSB?
FANUC Serial Servo Bus - high-speed serial communication link between controller and servo amplifiers. Carries position command and feedback data.
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Source: doc.eleok.com Fanuc manual
Category: Robot
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