Question

When I load my program with PID loops into a new processor, my loops are not present. Why not?

Answer

Since the PID configuration information is stored in V-memory and System V-memory, reloading the program will not restore the V-memory contents.

• Use File >> Save Project >> To PLC to restore the complete project and the PID tables will be restored.
  
• You can also restore the PID configuration by using PLC >> Copy Config Data From Disk To PLC and check "System Variable Memory" and "Variable Memory".

To fully backup a PLC project, while connected to the PLC, use File >> Save Project >> To Disk. This will save the ladder project and the V-memory data. If you use "Program" you will only get the ladder code, and not the V-Memory data.

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FAQ Subcategory: None

This item was last updated on 2021-02-22
Document ID: 232

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