What causes Siemens SINUMERIK alarm 12320?

REF parameter receiving a constant value instead of a variable identifier in subroutine call. REF parameter assigned the result of a mathematical expression instead of a variable name. Incorrect subroutine parameter declaration expecting a variable but receiving a literal value. Mixing of constant values or calculated results with REF parameter requirements in NC program logic.

How do I fix Siemens SINUMERIK alarm 12320?

1. Review the NC program at the specified block number and identify which parameter is flagged as non-variable 2. Verify that all REF parameters in the subroutine call use only variable identifiers (e.g., VARIABLE_NAME) and not constants or expressions (e.g., 10, 5+ANNA) 3. Check the subroutine definition to confirm parameter declaration includes REF keyword for the problematic parameter 4. Replace any constants or mathematical expressions passed to REF parameters with pre-calculated variable assignments performed before the subroutine call 5. Test the corrected NC program with a dry run to ensure all REF parameters now receive valid variable identifiers

Siemens SINUMERIK codes

axismd.ai

Siemens SINUMERIK Controller

Parameter · Intermediate · 20-45 minutes

Alarm 12320

Siemens 840D 12320 - Channel block parameter is no variable

A constant or the result of a mathematical expression has been assigned to a REF parameter instead of a variable at the time of the subroutine call, even though only variable identifiers are allowed. Examples: N10 XYZ (NAME_1, 10, OTTO) or N10 XYZ (NAME_1, 5 + ANNA, OTTO)

Siemens SINUMERIKParameterIntermediate20-45 minutes

12320

Siemens 840D 12320 - Channel block parameter is no variable

Channel block parameter is no variable

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

REF parameter receiving a constant value instead of a variable identifier in subroutine call
REF parameter assigned the result of a mathematical expression instead of a variable name
Incorrect subroutine parameter declaration expecting a variable but receiving a literal value
Mixing of constant values or calculated results with REF parameter requirements in NC program logic

Troubleshooting Steps

1Review the NC program at the specified block number and identify which parameter is flagged as non-variable
2Verify that all REF parameters in the subroutine call use only variable identifiers (e.g., VARIABLE_NAME) and not constants or expressions (e.g., 10, 5+ANNA)
3Check the subroutine definition to confirm parameter declaration includes REF keyword for the problematic parameter
4Replace any constants or mathematical expressions passed to REF parameters with pre-calculated variable assignments performed before the subroutine call
5Test the corrected NC program with a dry run to ensure all REF parameters now receive valid variable identifiers

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

Always verify with your machine manual or a certified technician before performing service procedures.