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Mitsubishi Electric Melsec Q Series User Manual page 112

Profibus-dp master module
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4
FUNCTIONS
(2) Starting and stopping I/O data exchange
[Output data exchange]
Data exchange start
request signal(Y00)
Data exchange start
completed signal(X00)
Bus cycle time (Bc)
Output data area (for mode 3)
(Un\G14336 to Un\G18431)
[Input data exchange]
Data exchange start
request signal(Y00)
Data exchange start
completed signal(X00)
Bus cycle time (Bc)
Input data area (for mode 3)
(Un\G6144 to Un\G10239)
Remark
4
- 3
4.1 PROFIBUS-DPV0 Functions
4.1.1 I/O data exchange
(a) Write the initial value of the output data to the Output data area (for mode 3)
(Un\G14336 to Un\G18431).
(b) Turn ON the Data exchange start request signal (Y00).
(c) When I/O data exchange is started after turning ON the Data exchange start
request signal (Y00), the Data exchange start completed signal (X00) turns ON.
(d) Input data from DP-Slaves are stored in the Input data area (for mode 3)
(Un\G6144 to Un\G10239).
(e) Turning OFF the Data exchange start request signal (Y00) turns OFF the Data
exchange start request signal (X00), and I/O data exchange is stopped.
I/O data exchange
started
Output data
at Bc
(Initial value)
Bc
I/O data exchange
started
Data of previous exchange
Figure 4.2 I/O Data Exchange Processing
For program examples of the I/O data exchange, refer to the following:
• Single CPU system:
• Redundant system:
Bc
Bc
Output data
Output data
at Bc
at Bc
Bc
Bc
Input data
Input data
at Bc
at Bc
Section 7.1, 7.8
Section 7.9.1
Bc
I/O data exchange
stopped
Output data
at Bc
I/O data exchange
stopped
Input data
at Bc

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