Mitsubishi FX3U-32DP, User Manual

Page: 51 / 74

45
FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
6 Buffer Memory Allocation
6.20 Cyclic Input Data Consistency Activate/Deactivate Flag [BFM #98 Bit0]
1
Int
roduct
ion
2
Specifi
cations
3
Inst
al
lati
on
4
Wi
rin
g
5
C
omm.
Out
lin
e on
PRO
FIB
US-
D
P
Ne
two
rk
6
B
uff
er M
em
ory
Al
loc
ati
on
7
Para
mete
r S
ett
ing
an
d N
etw
or
k
C
onf
igu
rat
ion
8
E
xam
ple
P
rogr
am
9
D
iagnos
tics
6.20 Cyclic Input Data Consistency Activate/Deactivate Flag [BFM #98 Bit0]
BFM Access : Read / Write
BFM#98 Bit0 turns ON when the DP communication requires data consistency for communication data
>16bit/block. The PROFIBUS Configuration Tool (e.g. GX-Configurator DP) automatically turns this bit ON.
Users can set/reset this bit manually as well, for example, by PLC program.
Acyclic data communication will always set the data consistency mode, regardless of this flag’s setting.
→
For details on Cyclic Communication, refer to Section 5.1
→
For details on the data consistency mode, refer to Section 5.1
6.21 Cyclic Input Data Send Flag [BFM #99 Bit0]
BFM Access : Read / Write
The 32DP turns this flag ON automatically when new data can be written to the Cyclic Input Data Send Area.
After the writing process is finished, the user must turn this flag OFF.
→
For details on the data consistency mode, refer to Section 5.1
6.22 Cyclic Input Data Send Area [BFM #100 to #171]
BFM Access : Read / Write
This is the data storage area for cyclic input data, bound to be transferred to the DP-Master. A maximum of
144 Bytes of cyclic input data can be stored.
→
For details on Cyclic Communication, refer to Section 5.1
Note
When the connected PLC is in STOP, the 32DP maintains no cyclic input data. It is necessary to prepare an
appropriate amount of initial data in the send buffer before the 32DP initializes the cyclic communication.
6.23 Cyclic Output Data Consistency Activate/Deactivate Flag
[BFM #298 Bit0]
BFM Access : Read / Write
BFM#298 Bit0 turns ON when the DP communication requires the data consistency. When a user sets the
data consistency mode for one or more I/O modules for the 32DP, and when the communication data
between those I/O modules and the 32DP>16bit/block, the user’s configuration will turn this bit ON
automatically. Users can set/reset this bit manually as well.
→
For details on the data consistency mode, refer to Section 5.1
6.24 Cyclic Output Data Read Flag [BFM #299 Bit0]
BFM Access : Read / Write
The 32DP turns this flag ON automatically when new cyclic output data is available in the Cyclic Output Data
Receive Area. After reading the data, the user must turn this flag OFF.
→
For details on the data consistency mode, refer to Section 5.1
Bit 0
Upper byte Lower byte
BFM Address
BFM #100
#101
#102
#103
2nd byte 1st byte
4th byte 3rd byte
6th byte 5th byte
8th byte 7th byte
40th byte 39th byte
#119
#120
42nd byte 41st byte
144th byte 143rd byte
#171
Copied to BFM #0 to #19
(TO instruction access)