Profibus-Dpv0 Functions; I/O Data Exchange - Mitsubishi Electric Melsec Q Series User Manual

4
FUNCTIONS

4.1 PROFIBUS-DPV0 Functions

4.1.1 I/O data exchange

The QJ71PB92V can operate as a DP-Master (Class 1) on the PROFIBUS-DP system
and perform I/O data exchange with DP-Slaves.
Up to 125 DP-Slaves can be connected to a single QJ71PB92V, enabling the exchange of
I/O data up to 8192 bytes.
QCPU
Device
Reading of
input data
Input data from
DP-Slave
Device
Writing of
output data
Output data to
DP-Slave
(1) Reading/writing I/O data
(a) Buffer memory
(b) Read/write methods
*1
* 1 Up to 124 DP-Slaves when QJ71PB92Vs are mounted on main base units in a redundant system
QJ71PB92V
Buffer memory
Input data area
(for mode 3)
Output data area
(for mode 3)
Input data
Output data
DP-Slave
(FDL address 1)
Figure 4.1 I/O Data Exchange
Read or write I/O data from the following buffer memory in the QJ71PB92V:
• Input data: Input data area (for mode 3) (Un\G6144 to Un\G10239)
• Output data: Output data area (for mode 3) (Un\G14336 to Un\G18431)
Read or write I/O data (from the buffer memory) to devices in QCPU by the
following methods.
Read/Write Methods
Automatic refresh
Dedicated instructions
(BBLKRD, BBLKWR)
MOV or FROM/TO instructions
4.1 PROFIBUS-DPV0 Functions
4.1.1 I/O data exchange
No input data
Output data
DP-Slave
(FDL address 2)
Table4.2 Read/Write Methods
Setting Location
GX Configurator-DP
Sequence program
Sequence program
Input data
No output data
DP-Slave
(FDL address 125)
Data Consistency Function
Available
Not available
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