239-0025

Check CC Timing Parameters

Access MOD function → Machine Parameters → CfgCC and verify MP7680 (CC_CYCLE_TIME) and MP7681 (CC_TIMEOUT) settings match system requirements.

Default CC_CYCLE_TIME should be 4ms for most TNC systems

Verify Network Load

In Service menu → TNCdiag → Communication, check CC bus load percentage. Should be below 80% for stable operation.

High bus loads above 90% can cause permanent communication failures

Reset CC Communication

Execute PLC function M_CC_RESET via MDI or set MP7690 (CC_RESET_REQUEST) to 1, then back to 0 to reinitialize communication.

Wait 10 seconds between reset commands to allow full initialization

Check FS Module Status LEDs

Examine the FS module in the control cabinet. Green LED should be solid, red LED off. Flashing patterns indicate hardware faults.

Never remove FS modules while system is powered - risk of safety system corruption

Verify FS Diagnostics

Access Service → TNCdiag → Safety → FS Status and check error counters. Values above 0 in communication error fields indicate hardware issues.

Screenshot diagnostic values before any resets for service documentation

Test FS Module Replacement

If available, swap FS module with known good unit. Requires safety parameter reload via Service → Safety → Load FS Parameters.

FS module replacement requires machine manufacturer authorization codes

Inspect CC Ethernet Connections

Check all RJ45 connectors on CC network for corrosion, bent pins, or loose retention clips. Verify cable routing away from power cables.

Use a cable tester to verify all 8 conductors have continuity and proper impedance

Check Network Statistics

In Service → TNCdiag → Communication → CC Statistics, monitor CRC errors and retransmission counters during operation.

Increasing error counts during machine movement indicate cable flexing issues

Replace Suspect Cables

Install new Cat5e or better Ethernet cables with proper industrial ratings. Update cable routing documentation in machine manual.

Always use shielded cables in CNC environments and maintain 6-inch separation from AC power

Verify CC Node Addresses

Check MOD → Machine Parameters → CfgCC → MP7650 (CC_NODE_ADDRESS) against network topology diagram. Each node must have unique address.

Document all CC addresses in machine logbook for future reference

Scan Network for Conflicts

Use Service → TNCdiag → Communication → CC Network Scan to identify all active nodes and detect address duplications.

Network scans may temporarily disrupt communication - perform during maintenance windows

Reconfigure Conflicting Addresses

Assign new unique addresses starting from lowest available number. Update MP7650 and cycle power to activate changes.

Reserve addresses 1-10 for critical safety systems, use higher numbers for auxiliary devices