Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 358)

6.3 Cross References
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6.3 Cross References
Cross referencing allows you to check whether a register is used in a program, and where it is used.
The search results indicate output registers in red, input registers in blue.
If the value of a register is different from its set value, it means that the value of the register may have been overwritten
somewhere in the program. In this case, you can search for the registers using cross references. Check the registers dis-
played in red to locate the instructions that are overwriting them.
Cross referencing executed.
Search Results Display
Red: Output registers
Blue: Input registers