35
FX
3U
-32DP PROFIBUS-DP Interface Block
User’s Manual
5 Communication Outline on PROFIBUS-DP Network
5.4 Global Control
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
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8
E
xam
ple
P
rogr
am
9
D
iagnos
tics
5.4.2
FREEZE and UNFREEZE Global Control
The FREEZE/UNFREEZE Global Control handles the cyclic input data communication from the 32DP to the
DP-Master.
→
For datails on Global Control, refer to the DP-Master’s Manual
→
For Cyclic Input Data, refer to Chapter 6
1) FREEZE Global Control command
In Freeze mode, the cyclic input data from the 32DP in the group specified by DP-Master is not
immediately transferred to its input image memory. The 32DP holds the cyclic input data until the next
FREEZE/UNFREEZE Global Control command. When receiving the next FREEZE/UNFREEZE
command, the 32DP transfers the data to the input image memory.
2) UNFREEZE Global Control command
An UNFREEZE Global Control command releases the 32DP from FREEZE mode and the 32DP starts
updating the cyclic input data continuously.
By specifying groups of DP-Slaves, the DP-Master sends the UNFREEZE command arbitrarily to those
DP-Slave groups, similar to the FREEZE command.
Note
When using the FREEZE Global Control command, the cyclic input data (received from the DP-Slave) is not
refreshed until the next FREEZE or UNFREEZE global command to the DP-Slave.
(Group 8)
(Group 3)
(Group 3)
(Group 3)
PROFIBUS-DP Network
DP-Slave 1
. . .
DP-Slave 2
. . .
DP-Slave 3
. . .
DP-Slave n
. . .
Input image memory: The data is always refreshed by polling.
. . .
<During UNFREEZE mode(default)>
The data is transferred to the input image memory immediately (normal condition)
<During FREEZE mode>
The data is transferred to the input image memory at the FREEZE command from the
DP-Master.
. . .
FREEZE Command
. . .
Example: Sending the FREEZE command to DP-Slaves in
group 3.
DP-Master
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