239-01B2

Check HSCI Configuration

Access MOD function → Settings → Machine Parameters → CfgAxisList (MP1020) to verify the number of configured axes and their cyclic data requirements.

Monitor Bus Load

Use PLC → Status → HSCI Bus Load to check current communication load percentage. Values above 80% indicate potential overload conditions.

Adjust Cyclic Data Rate

Modify MP1410 CfgFastInputs and MP1420 CfgFastOutputs to reduce non-essential cyclic data transmission from drives.

Prioritize safety-critical axes for fastest cyclic rates and reduce rates for auxiliary axes.

Verify Drive Configuration

Check each drive's cyclic telegram configuration in MP102x series parameters to ensure optimal data packet sizes.

Review Encoder Configuration

Check MOD → Settings → Machine Parameters → MP4xxx series for encoder resolution and transmission rates on all configured measuring systems.

Optimize Position Loop Timing

Adjust MP1800 CfgPositionLoopTime to balance encoder feedback frequency with system processing capacity, typically 62.5μs to 250μs.

Higher resolution encoders may require longer position loop times to prevent communication overload.

Disable Unused Measuring Systems

Set MP4110 EncoderInputReference to 0 for any unused encoder inputs to eliminate unnecessary cyclic communication.

Check Linear Scale Configuration

Verify MP4xxx parameters for linear scales are set to appropriate resolution without excessive interpolation factors.

Analyze PLC Program

Review PLC program for excessive use of cyclic data requests like Q4xx (axis positions) or M-functions in rapid succession.

Optimize Data Request Frequency

Modify PLC program to reduce frequency of position queries and status requests, implementing timer-based sampling instead of continuous polling.

Ensure safety-critical position monitoring is not compromised when reducing data request frequency.

Check Cyclic I/O Configuration

Verify MP7xxx series parameters for I/O module cyclic data exchange rates and reduce non-critical I/O update frequencies.

Implement Data Buffering

Use PLC variables to buffer frequently accessed position data rather than continuous HSCI queries.

Isolate HSCI Network

Verify HSCI bus is properly isolated from external Ethernet networks and check MP6xxx series network configuration parameters.

Check Network Topology

Ensure proper HSCI bus termination and verify cable integrity between controller and all connected drives/modules.

Use TNC's built-in cable test function in Service mode to verify HSCI communication quality.

Monitor External Communications

Temporarily disable DNC, remote access, and other external communication protocols to isolate the cyclic overload source.

Verify Grounding and Shielding

Check electrical cabinet grounding and HSCI cable shielding to eliminate communication noise that could cause retransmissions.

Check System Temperature

Monitor controller temperature in MOD → Info → Temperature and ensure adequate cooling airflow to prevent thermal throttling.

Verify Memory Status

Check available system memory and storage space in MOD → Info → Memory to identify potential resource constraints.

Perform Hardware Diagnostics

Run built-in hardware diagnostics through Service mode to identify failing components or communication interfaces.

Hardware diagnostics may require machine downtime and should be coordinated with production schedules.

Update System Software

Verify current NC software version and consider updates that may include FS microcontroller performance improvements.