Mitsubishi Electric MELDAS 60 Series Programming Manual page 224

<When tool is changed>
When tool is changed, the spindle tool number is set in R3720, R3721. (User PLC)
Spindle tool number
(R3720-R3721)
Standby tool number
(R3722-R3723)
Spindle tool data
(R3724-R3735)
Tool data file
NC
(Controller internal data)
When the spindle tool number changes, the controller
assumes that the spindle tool is changed, and searches the
tool data file for the tool data of the new tool.
The controller executes life management and tool offset
based on the tool data. It also outputs the tool data to
R3724~R3735 every user PLC main cycle.
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9. Exclusive Commands