Omron NJ501-5300, Instruction & Reference Manual, Page: 37 / 142

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1 Basic Information on NC Programming
NJ/NY-series G code Instructions Reference Manual (O031)
Wh
at is
Moda
l?
1
What is Modal?
There are two types of G codes: One that is valid only in its block, and the other that continues to be
valid until another G code of the same group is specified. The former is called non-modal G code, and
the latter modal G code.
Modal G codes are summarized into some G code groups. The group is called a modal group.
In the same modal group, G codes that cannot hold simultaneously are summarized. One of the
G-code states is always preserved. For example, G90 (Absolute Dimension) and G91 (Incremental
Dimension) are summarized into modal group 03.
Refer to Instructions on page 1-2 for information about which G code is summarized in which modal
group.