27008

Check Physical Switch Position

Locate the 'BLOCK SKIP' or 'SKIP' switch on the machine control panel and verify its position. Toggle to OFF position if skipping is not desired.

On older SINUMERIK systems, this switch may be labeled as 'SATZ UEBERG' in German installations.

Verify Switch Functionality

Toggle the switch ON/OFF while monitoring the HMI status display to confirm proper switch operation and signal transmission to NCK.

Ensure machine is in safe state before testing switch functionality.

Test Program Execution

Run a test program containing optional blocks (/) to verify that block skip function responds correctly to switch position changes.

Access Machine Control Panel

Navigate to HMI main screen and select 'Machine' > 'Machine Control Panel' or press the MCP softkey to access virtual control panel functions.

On SINUMERIK 840D sl systems, look for the block skip icon in the channel status area.

Check Block Skip Status

Locate the 'Block Skip' or '/' symbol in the virtual control panel and verify its activation state. Click to toggle OFF if not required.

Verify with production personnel before disabling block skip as it may be intentionally set for current job.

Verify Channel Status

Check the channel status display for block skip indicator and confirm the setting matches your intended program execution requirements.

Review Active NC Program

Open the current NC program in the editor and search for all blocks beginning with '/' character to identify optional blocks.

Use the HMI search function (Ctrl+F) to quickly locate all '/' prefixed blocks in large programs.

Analyze Skip Block Content

Review each optional block to determine if the contained operations are critical for the current machining operation or truly optional.

Pay special attention to tool changes, coolant commands, and safety moves that may be incorrectly marked as optional.

Modify Program or Skip Setting

Either remove the '/' prefix from critical blocks or disable block skip function based on production requirements for the current job.

Check PLC Interface Signals

Access SINUMERIK Diagnostics > PLC > Interface Signals and monitor DB21 (NCK to PLC) and DB31 (PLC to NCK) for block skip related signals.

Look specifically for signals related to optional stop and block skip functions in the interface data blocks.

Review PLC Program Logic

Examine the PLC program for custom logic that may be setting block skip signals based on operating modes, safety conditions, or production requirements.

Only qualified PLC programmers should modify PLC logic - improper changes can affect machine safety systems.

Consult Machine Documentation

Review machine builder documentation for any custom block skip implementations or safety-related automatic skip functions specific to this machine configuration.