Haas Alarm 260 occurs when the control detects an unexpected state change on the probe input signal during an active probing cycle, typically due to signal interruption, premature triggering, or failure to return to the untriggered state. The NGC control continuously monitors the probe input and expects clean signal transitions only at the moment of stylus contact.
HaasSystemBasic10-30 minutes
260
Haas 260 - LANGUAGE CRC | Haas CNC Alarm
LANGUAGE CRC
This alarm means the control has detected a cyclic redundancy check (CRC) error in the language file stored in the MOCON non-volatile memory. The CRC algorithm verifies file integrity, and a mismatch indicates the language translation data has become corrupted, which can cause display errors, missing text, or garbled messages on the screen. The machine may still operate but user interface reliability is compromised.
Root Cause Summary
Haas Alarm 260 occurs when the control detects an unexpected state change on the probe input signal during an active probing cycle, typically due to signal interruption, premature triggering, or failure to return to the untriggered state. The NGC control continuously monitors the probe input and expects clean signal transitions only at the moment of stylus contact.
Safety
Probe measurement invalid
Causes and Fixes
1
Check Probe Battery Status
Access CURRENT COMMANDS > PROBING and verify probe battery indicator shows green/good status. Replace batteries if indicator shows yellow or red.
Renishaw probes typically show battery status via LED sequence - 3 flashes = good, 2 flashes = replace soon
2
Verify Optical Path
Clean receiver lens on spindle and transmitter on probe body. Ensure no coolant, chips, or debris blocking line-of-sight between probe and receiver.
Use only lint-free cloth and appropriate cleaning solution - avoid scratching optical surfaces
3
Test Signal Strength
Navigate to SETTING 31 (PROBE INPUT) and manually trigger probe stylus while monitoring input state change in real-time diagnostics.
Signal should change cleanly from 0 to 1 without flickering or intermediate states
1
Inspect Probe Cable
Examine entire cable length for cuts, kinks, or wear points especially at cable track entry/exit points and M8 connector. Check for coolant ingress at connector.
Power down machine before disconnecting probe cables to avoid damaging input circuits
2
Test Cable Continuity
With machine powered down, use multimeter to check continuity between probe tip and machine input terminals. Resistance should be <5 ohms with no intermittent opens.
Flex cable while testing to identify intermittent breaks that only show under movement
3
Verify Input Circuit
Check SETTING 31 (PROBE INPUT) configuration matches probe type. For skip signal probes, verify input pulls high when probe triggers and returns low when released.
Some probes require SETTING 31 to be set to 1 (normally closed) vs 0 (normally open)
1
Clean Stylus Assembly
Remove stylus and clean both stylus ball and probe body seat with appropriate cleaning solution. Remove all chips, coolant residue, and debris.
Handle stylus carefully - ceramic balls can chip if dropped or impacted
2
Inspect Stylus Condition
Check stylus ball for chips, cracks, or wear. Verify stylus shaft is straight and kinematic seat surfaces are undamaged.
Stylus balls should be perfectly spherical - any flat spots or chips will cause erratic triggering
3
Test Stylus Return
Manually deflect stylus in all directions and verify it returns to center position consistently. Monitor SETTING 31 input state during manual deflection tests.
Stylus should return to untriggered state within 0.5 seconds of release
1
Verify Macro Variables
Check probing macro call parameters including #135 (probe type), #136 (approach distance), and #137 (retract distance) match actual probe configuration and part setup.
Use MACRO VARIABLES display to verify current values match program intent
2
Review Feed Rates
Ensure probing feed rate is appropriate for probe type - typically 10-50 IPM for touch probes. Excessive feed rates can cause signal processing issues.
Never exceed probe manufacturer's maximum approach velocity
3
Check Approach Direction
Verify probing approach direction and distance won't cause stylus overtravel or collision. Review G65 P9023 I, J, K direction parameters.
Always approach from known clear direction with adequate clearance for stylus deflection
1
Test Input Circuit
Navigate to DIAGNOSTICS > INPUTS and manually short probe input terminals while monitoring real-time input status. Signal should change cleanly without bouncing.
Only qualified technicians should access control cabinet - high voltage present
2
Check I/O Board LEDs
Observe I/O board LED indicators for probe input circuit. LED should illuminate steadily when input is active, not flicker or remain dim.
