Mitsubishi FX3U-32DP, User Manual

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46
FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
6 Buffer Memory Allocation
6.25 Cyclic Output Data Receive Area [BFM #300 to #371]
6.25 Cyclic Output Data Receive Area [BFM #300 to #371]
BFM Access : Read Only
This is the data storage area for cyclic output data from the DP-Master. A maximum of 144 Bytes of cyclic
output data can be stored.
→
For details on Cyclic Communication, refer to Section 5.1
6.26 Acyclic Input Data Send Flag (Class1) [BFM #499 Bit0]
BFM Access : Read / Write
The 32DP turns this flag ON automatically when new acyclic input data can be written to the Acyclic Input
Data Send Area. Acyclic Communication always requires the data consistency. After the writing process is
finished, the user must turn this flag OFF.
→
For details on Acyclic Communication, refer to Section 5.2
→
For details on the data consistency mode, refer to Section 5.1
6.27 Acyclic Input Data Send Area (Class1) [BFM #500 to #572]
BFM Access : Read / Write
This is the data storage area for acyclic input data, bound to be transferred to the DP-Master. A maximum of
140 Bytes of acyclic input data can be stored.
→
For details on Acyclic Communication, refer to Section 5.2
6.28 Acyclic Output Data Read Flag (Class1) [BFM #699 Bit0]
BFM Access : Read / Write
The 32DP turns this flag ON automatically when new acyclic output data is available in the Acyclic Output
Data Receive Area. Acyclic Communication always requires data consistency. After the communication
process is finished, the user must turn this flag OFF.
→
For details on Acyclic Communication, refer to Section 5.2
→
For details on the data consistency mode, refer to Section 5.1
BFM No. Name Description Access
BFM #500 Slot Number
Number of the slot whose data has been read. This number is defined by
the addressing for acyclic services.
(Only Slot 0 possible, must be set by the DP-Master)
Read Only
BFM #501 Index
Indicates the index of the data being read.
(Only Index 144 possible, must be set by the DP-Master)
Read Only
BFM #502 Length
Length of the data to be written
(Data length in Bytes, requested by the DP-Master).
The valid range is 0 to 140.
Read Only
BFM #503
to #572
Data Acyclic User Input Data to be sent to the DP-Master. Read/Write
Bit 0
Upper byte Lower byte
BFM Address
BFM #300
#301
#302
#303
2nd byte 1st byte
4th byte 3rd byte
6th byte 5th byte
8th byte 7th byte
40th byte 39th byte
#319
#320
42nd byte 41st byte
144th byte 143rd byte
#371
Copied to BFM #0 to #19
(FROM instruction access)