14765

Common Causes

• Excessive number of link variable assignments exceeding NCU link bandwidth capacity per interpolation cycle
• Link network congestion due to simultaneous data transfers from multiple NCUs
• Inadequate interpolation cycle time for the volume of variable assignments being transferred
• Link network configuration mismatch or insufficient buffer allocation
• Real-time priority conflicts between NCU link communication and other axis operations

Troubleshooting Steps

1. 1Review the part program and identify all link variable assignment operations ($a_dld array writes) occurring within a single interpolation cycle; consolidate or distribute assignments across multiple cycles if possible
2. 2Check NCU link network configuration parameters and verify bandwidth settings match the current system setup using SINUMERIK Operate or manufacturer diagnostics
3. 3Reduce the number of simultaneous link variable transfers by implementing assignment batching; spread critical updates across consecutive interpolation cycles to stay within transfer limits
4. 4Examine system load and cycle time settings; increase interpolation cycle time if feasible to allow sufficient bandwidth for all pending variable assignments
5. 5Monitor link network traffic using system diagnostics to identify congestion; isolate non-critical communication or prioritize essential variable transfers