Mitsubishi FX0N-32NT-DP, User Manual

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Buffer Memories (BFMs) Allocation 4
4-1
4. Buffer Memories (BFMs) Allocation
Caution:
1) Do not access the buffer memory defined as “Not used” (BFM #31) by FROM/TO
instruction. There is a possibility to cause abnormal operation of the 32NT-DP if
accessing these buffer memories.
2) Do not write to (access by TO instruction) the buffer memory defined as “Read only”
(BFM #20, #22 ~ #26, #29, #30) by the programmable controller. It is not possible to
operate the 32NT-DP by writing to (accessing by TO instruction) these buffer memories.
Note:
The sending data and receiving data buffers share the same buffer memory addresses
(BFM #0 ~ #19) for use with FROM and TO instructions. This means it is not possible to
check the buffer memory data using a FROM instruction because this instruction only reads
the receive buffer data.
FX0N-32NT-DP Profibus-DP Interface Unit