If SRVO-131 (Encoder Communication Error) appears, try these immediate actions:
These steps can resolve temporary communication interruptions.
FANUC Alarm SRVO-131 (Encoder Communication Error) occurs when the controller cannot properly communicate with the encoder (pulse coder).
The encoder is responsible for:
When communication is lost or unstable, the robot stops to prevent position errors and unsafe motion.
SRVO-131 indicates a breakdown in communication between:
This typically means:
Cable issues are the most common cause.
Common issues include:
1. Broken or worn cables
2. Loose connectors
3. Signal shielding damage
Poor connections can interrupt communication.
Common issues include:
1. Improperly seated connectors
2. Bent or oxidized pins
3. Contaminated contact surfaces
A defective encoder may fail to communicate.
Common issues include:
1. Internal encoder damage
2. Signal output instability
3. Aging encoder components
The amplifier acts as the communication bridge.
Common issues include:
1. Feedback processing failure
2. Internal communication faults
3. Hardware degradation
External interference can disrupt communication signals.
The following components are commonly required when resolving SRVO-131 alarms:
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A practical diagnostic approach widely used by field engineers to pinpoint the failure point:
The Swap Test:
Why it works:
SRVO-131 is often caused by intermittent instability rather than complete signal loss. Robot cables endure constant torsion and vibration, leading to internal cable degradation, shielding failure, or connector fatigue—issues that are nearly impossible to detect through visual inspection alone.
Next Step:
If the swap test confirms a cable fault, replacing the affected part is the only way to ensure long-term stability. For high-flex industrial environments, we recommend using shielded FANUC robot encoder cables to prevent future signal interference and downtime.
SRVO-131 indicates unstable encoder communication:
Ignoring this issue can result in position errors, unexpected motion, or system shutdowns.
These alarms are often related to encoder or communication system issues.
It is usually caused by encoder cable faults, connector issues, servo motor encoder failure, or amplifier problems.
Only if the issue is temporary. Persistent alarms require immediate troubleshooting.
Yes, as it affects real-time position feedback and motion control.
Inspect cables, reseat connectors, and replace faulty components if needed.
Explore the Full Guide: Industrial Robot Fault Codes Library → Fanuc Alarm Codes
Explore the complete guide for troubleshooting, repair strategies, and component replacement across industrial robot systems.
Key components commonly involved in fanuc alarm troubleshooting issues and replacements.
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