Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 199

6 PROGRAMMING
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POINT
(1) When handling data larger than 32 bits (two words), enable the station-based
block data assurance described in Section 6.2.2, or apply interlocks in the
programs by seeing the interlock program example in Section 6.2.3.
(2) When the network is set up in the MELSECNET/10 mode, 32-bit data
assurance is valid only stations with QCPU. For those with ACPU/QnACPU,
set interlock referring to interlock program example in Section 6.2.3.
MELSEC-Q
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