220-0025

Check macro parameter values

Navigate to Programming and Operating > Program Run > PLC and examine the macro call parameters in the PLC strobe. Verify Q-parameter assignments for logical consistency.

Use the macro trace function to monitor parameter flow during execution

Validate parameter ranges

Check that all macro parameters fall within valid ranges defined in machine parameters MP7440-MP7459 (PLC interface parameters). Ensure no parameters exceed maximum values.

Invalid parameters can cause unpredictable machine behavior

Review macro logic

Examine the macro code for conditional statements that might create contradictory parameter assignments based on current machine state or input conditions.

Check PLC strobe timing

Access Setup > Machine Parameters and review MP7450 (PLC strobe delay time) and MP7451 (PLC strobe duration). Verify timing allows complete macro execution.

Increase strobe duration if macro execution is complex

Monitor PLC interface status

Use Diagnostics > PLC > Interface to observe real-time PLC strobe signals and verify proper handshaking between TNC and PLC during macro calls.

Adjust strobe parameters

If timing issues persist, increase MP7450 value incrementally (typically 10-50ms) to allow proper data stabilization before strobe acknowledgment.

Verify PLC memory mapping

Check Setup > PLC > Memory Assignment and ensure all PLC strobe memory addresses correspond to valid TNC memory locations as defined in MP7460-MP7479.

Incorrect memory mapping can corrupt system data

Check memory access permissions

Verify that the PLC has read/write permissions for the memory areas being accessed during strobe implementation. Review user access levels in Setup > User Management.

Test memory accessibility

Use the TNC's built-in memory test function in Diagnostics > System > Memory Test to verify integrity of memory areas used in PLC strobe operations.

Validate macro syntax

Open the macro in Programming and Operating > Program Edit and run syntax check. Look for deprecated cycle calls or invalid parameter assignments that affect PLC communication.

Check cycle compatibility

Verify that any cycles called within the macro are compatible with PLC strobe execution. Some cycles may not function properly when called via PLC interface.

Use CALL PGM instead of direct cycle calls for better PLC compatibility

Test macro independently

Execute the macro manually without PLC strobe to isolate whether the issue is macro-specific or PLC interface-related. Check for proper completion and parameter handling.