230-0460

Access Machine Parameters

Press MOD key, enter machine parameter mode (requires keyswitch position 2 or password depending on TNC model), navigate to General → CfgAxes → Axis [affected axis]

Working in machine parameters requires proper authorization and documentation. Incorrect changes can damage machine or control.

Verify MP100 Axis Type

Check MP100 for the affected axis. Valid values: 0=not used, 1=linear axis, 2=rotary axis display ±180°, 3=rotary axis display 0-360°, 4=modulo axis. Ensure value matches physical axis configuration.

Cross-reference with MP110 (axis designation) to ensure logical consistency between axis type and its assigned letter (X/Y/Z for linear, A/B/C for rotary).

Validate Dependent Parameters

After confirming MP100, verify MP101-109 (display resolution, monitoring windows) and MP200-202 (software limit switches) are appropriate for the defined axis type.

Linear axes require software limits in MP200/201, while modulo axes (MP100=4) should have these set to 0 or undefined.

Restart Control and Test

Save all parameter changes, perform a complete control restart (power cycle), and verify the axis configuration loads without alarm during POST sequence.

Review Encoder Assignment

In machine parameters, navigate to the affected axis and check MP600 (encoder input assignment). Verify it references a valid encoder input number that corresponds to physically connected encoder hardware.

Use Diagnostics → Encoder to view real-time encoder signals and confirm the assigned input is receiving valid encoder pulses.

Verify Encoder Type Parameter

Check MP601 (encoder type) matches the actual encoder: 1=1 Vpp, 2=TTL, 3=EnDat 2.1, 4=EnDat 2.2, 5=SSI, etc. Confirm MP605 (lines per revolution or pitch) matches encoder specifications exactly.

Incorrect encoder line count can cause following errors during operation even if alarm clears. Verify against encoder nameplate or documentation.

Check Encoder Monitoring Settings

Verify MP606 (encoder error monitoring) and MP607 (encoder frequency monitoring) are set appropriately. Overly restrictive monitoring can cause false configuration errors. Standard values: MP606=1 (active), MP607=manufacturer-specific maximum frequency.

For EnDat encoders, use the control's encoder test function in Diagnostics menu to verify communication and parameter readout from the encoder memory.

Validate Encoder Input Hardware

If parameters appear correct, physically inspect encoder cable connections at both control and motor/scale ends. Check encoder input LED indicators on PLC or drive modules for signal presence.

Check Reference Point Type

Review MP300 for the affected axis. Common settings: 0=no reference, 1=reference via reference mark and switch, 2=reference via reference mark only, 3=absolute encoder (no reference required). Ensure setting matches available reference hardware.

Axes with absolute EnDat encoders should have MP300=3. Using any other value creates a configuration conflict.

Verify Reference Cam Parameters

If MP300=1, check MP303 (reference cam input assignment) references a valid PLC input, MP304 (reference cam evaluation: 0=make, 1=break), and MP305 (search direction: 0=negative, 1=positive) are defined and consistent with machine design.

Validate Reference Point Position

Check MP310 (reference point coordinate) is defined and falls within software limits (MP200/201) if applicable. For rotary axes, ensure MP310 is within the defined display range (MP100 dependent).