230-0423

Access Machine Parameters

Press MOD key, enter password, select 'Machine Parameters'. Navigate to the MP1xxx series for the affected axis (e.g., MP1000-MP1999 for first axis, MP2000-MP2999 for second axis).

Accessing machine parameters requires password protection. Unauthorized changes can render the machine inoperable.

Verify Core Axis Parameters

Check that essential parameters exist: MP1010 (axis name assignment), MP1020 (reference point position), MP1030 (reference point offset), MP1040 (direction of traverse to reference point). Ensure no parameter shows as undefined or contains invalid values.

Use the control's parameter search function (soft key 'SEARCH PARAM') to quickly locate all parameters for the specific axis number.

Compare with Backup or Documentation

If available, compare current parameters with machine documentation or parameter backup file (*.PAR). Restore missing parameters from backup using MOD > Data Transfer > Import Parameters if necessary.

Heidenhain controls store parameter backups in TNC:\system\backup. Check for most recent *.PAR file before the alarm occurred.

Reload and Restart

After correcting parameters, select 'END' softkey to save changes. Perform a complete control restart (power cycle) to reinitialize all axes with corrected parameters.

Check Axis Name Assignment

In MOD > Machine Parameters, check MP1010 (Axis designation). Verify the axis name (X, Y, Z, U, V, W, A, B, C) matches the intended axis type and position in the machine configuration.

Linear auxiliary axes should use U, V, W designations; rotary axes use A, B, C. Mixing these improperly triggers configuration errors.

Verify Rotary Axis Parameters

If axis is designated A, B, or C in MP1010, confirm MP1800 (Modulo range) is set appropriately (typically 360 for degrees). Check MP1810 (Display mode) and MP1820 (Hirth grid) are configured for rotary operation.

Linear axes should NOT have modulo parameters defined. This creates a configuration conflict.

Validate Encoder Configuration Match

Check encoder parameters MP6xxx series match the axis type. Rotary encoders require different scaling factors than linear encoders. Verify MP6010 (lines per revolution vs. reference marks per mm) matches axis type.

MP6010 value format differs: linear encoders use reference marks/mm; rotary encoders use lines/revolution. Incorrect format triggers this alarm.

Correct and Verify

Correct any mismatched parameters to align axis designation with axis type configuration. Save parameters, restart control, and verify axis initializes properly in MOD > Position Display.

Identify Encoder Type

In MOD > Machine Parameters, locate MP6xxx series for affected axis. Check MP6000 (encoder input assignment) and verify it matches the physical connection (EnDat, 1 Vpp, TTL, etc.).

Heidenhain TNC controls support multiple encoder interfaces on different inputs. Verify the encoder is connected to the correct X1, X2, or X3 encoder input as defined in parameters.

Verify Encoder Specific Parameters

For EnDat encoders: Check MP6005 (EnDat address). For 1Vpp encoders: Verify MP6010 (signal periods per revolution/mm) and MP6020 (reference mark evaluation). Ensure values match encoder datasheet specifications exactly.

Incorrect signal period settings can cause calculation overflows that trigger configuration errors. Always verify against encoder manufacturer specifications.

Check Encoder Monitoring Parameters

Review MP6050 (encoder error monitoring) and MP6060 (encoder tolerance band) settings. Overly restrictive values or disabled monitoring can cause configuration validation failures.

If recently replaced an encoder, ensure the new encoder's specifications match exactly, especially line count and interface type. Parameter sets from old encoder cause this alarm.

Test Encoder Communication

After parameter correction, access MOD > Test Functions > Encoder Test. Verify the encoder shows valid position values and no communication errors before exiting MOD mode.