How can I fix the illegal data signal error in my FMESH tally code in MCNP6?

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SUMMARY

The discussion centers on resolving the "illegal data signal" error encountered in FMESH code while using MCNP6. The user provided their FMESH code, which includes parameters such as GEOM, IMESH, JMESH, and EMESH. A key suggestion was to check the formatting of the GEOM parameter, specifically changing "X Y Z" to "XYZ" to align with MCNP6's strict formatting requirements. Proper formatting is crucial for successful execution in MCNP6.

PREREQUISITES
  • Understanding of MCNP6 software and its syntax
  • Familiarity with FMESH code structure and parameters
  • Knowledge of input/output file handling in MCNP6
  • Basic troubleshooting skills for coding errors
NEXT STEPS
  • Review MCNP6 documentation on FMESH syntax and formatting
  • Learn about common error messages in MCNP6 and their resolutions
  • Explore best practices for input file formatting in MCNP6
  • Investigate the use of debugging tools for MCNP6 code
USEFUL FOR

Researchers, physicists, and engineers working with MCNP6 who are troubleshooting FMESH code errors or seeking to optimize their simulation inputs.

Marina123456
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Hi everyone, I would help in such problem. i have tried to use a fresh card, but it always gives an illegal data signal am using mcnp6. here is my fmesh code. thanks
FMESH44:n GEOM=X Y Z ORIGIN=-10 -10 -10
IMESH=-50 IINTS=5
JMESH=50 JINTS=11
KMESH=50 KINTS=8
EMESH= 1e-7 1 2
 
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Hi, welcome to physicsforums,

If you can share your input or output files, renaming to add .txt will let you attach it to a post here. MCNP is very sensitive to formatting. Alternatively you can put the lines in bbcode CODE tags so the formatting is not lost.

A guess but you have "X Y Z" when maybe it should be "XYZ".
 
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