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Mitsubishi Electric Melsec Q Series User Manual page 117

Profibus-dp master module
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4
FUNCTIONS
(1) Global control services
(a) SYNC, UNSYNC
Bus terminator
(Group 1)
1) SYNC
This service starts the SYNC (output synchronization) mode.
In the SYNC mode, the output status is refreshed every time a DP-Slave
receives the SYNC service.
If no SYNC service is received, the output status is held.
2) UNSYNC
This service ends the SYNC (output synchronization) mode.
Power
QCPU
supply
module
(Group 2)
DP-Slave 1
DP-Slave 2
...
...
Output image memory: Data are refreshed at all times by polling.
...
<During UNSYNC execution/Default>The output image memory values are output without being
changed. (Normal status)
...
<During SYNC execution>The output image memory values are output only once at the timing
of the SYNC service.
...
SYNC service (Issued within the same group)
...
Output to external device.
Figure 4.6 SYNC, UNSYNC
4.1 PROFIBUS-DPV0 Functions
4.1.3 Global control function
DP-Master (Class 1)
QJ71
PB92V
SYNC service
is sent to group 1.
(Group 1)
DP-Slave 3
...
...
Bus terminator
(Group 1)
DP-Slave n
...
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