Mitsubishi Electric GOT2000 Series Connection Manual page 121

The bit device status depends on the SFC program status (active or inactive). When the SFC program is inactive, the bit device is
off (stores 0).
If a step relay (S) is used in the random read processing, specify the relevant step relay (block) (BLS) on GT SoftGOT2000 or GT
Simulator3.
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2.2 MELSEC iQ-R, RnMT/RT, CR800-D (GT21 only)