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2-22 Series 90-30/20/Micro Programmable Controllers Reference Manual
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September 1998 GFK-0467K
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When %Q or %M references are used with retentive coils, or are used as function block outputs,
the contents are retained through power loss and RUN-TO-STOP-TO-RUN transitions.
Retentive coils include retentive coils —(M)—, negated retentive coils —(/M)—, retentive SET
coils —(SM)—, and retentive RESET coils —(RM)—.
The last time a %Q or %M reference is programmed on a coil instruction determines whether the
%Q or %M reference is retentive or non-retentive based on the coil type. For example, if %Q0001
was last programmed as the reference of a retentive coil, the %Q0001 data will be retentive.
However, if %Q0001 was last programmed on a non-retentive coil, then the %Q0001 data will be
non-retentive.