Mitsubishi FX3U-32DP, Руководство пользователя

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34
FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
5 Communication Outline on PROFIBUS-DP Network
5.4 Global Control
5.4 Global Control
The 32DP supports SYNC,UNSYNC, FREEZE and UNFREEZE Global Control Services.
The default setting is UNSYNC and UNFREEZE in Global Control Mode.
5.4.1 SYNC and UNSYNC Global Control
The SYNC/UNSYNC Global Control handles the cyclic output data from the DP-Master to the 32DP as
follows:
→
For details on Global Control, refer to the DP-Master’s Manual
→
For Cyclic Output Data, refer to Chapter 6
1) SYNC Global Control command
In SYNC mode, the cyclic output data to the 32DP in the group(s) specified by DP-Master is not
immediately transferred to the output image memory of the 32DP. The 32DP holds the cyclic output data
until the next SYNC/UNSYNC Global Control command. When receiving the next SYNC/UNSYNC
command, the 32DP transfers the data to its output image memory.
2) UNSYNC Global Control command
The UNSYNC Global Control command releases the 32DP from SYNC mode and the 32DP starts
updating the cyclic output data continuously.
By specifying groups of DP-Slaves, the DP-Master sends the UNSYNC command arbitrarily to those DP-
Slave groups, similar to the SYNC command.
Note
When using SYNC Global Control command, the cyclic output data (sent to the DP-Slave) is not refreshed
until the next SYNC or UNSYNC global command is sent to the DP-Slave.
DP-Master
Group 8
Group 2 Group 5 Group 1
PROFIBUS-DP Network
Sending the Global Control Command
to the DP-Slaves in groups 1 and 2 Example:
(Group 1) (Group 2) (Group 1) (Group 1)
PROFIBUS-DP Network
DP-Slave 1
. . .
DP-Slave 2
. . .
DP-Slave 3
. . .
DP-Slave n
. . .
Example: Sending the SYNC command to DP-Slaves in group 1.
Output image memory: Data is always refreshed by polling.
. . .
<During UNSYNC mode(default)>
The data is transferred to the output image memory immediately (normal condition)
<During SYNC mode>
The data is transferred to the output image memory at the SYNC command from the
DP-Master.
. . .
SYNC Command
. . .
DP-Master