Omron C200HW-PRM21 Operation Manuals page 79

Control and status area
Multicast
Broadcast
and Unfreeze has priority over Freeze.
The Clear_Data command will always clear the output data,
whether the Freeze command is activated or not.
Note The control commands 'Freeze' / 'Sync' are overruled by a reset
of the slave. The control command has to be issued again after
the reset to have the slave working in the desired mode.
IR n.14~15 Not used by C200HW-PRM21.
IR n+1 Group select and Station address
PROFIBUS-DP provides multi-peer communication (broadcast
and multicast).
To enable multicast communication, each slave can be assigned
to one or more groups (See 4-3-5, 'Group membership'). Up to
eight groups can be defined (1~8). A target group for a multicast
command is selected by setting the corresponding bit in IR n+1.
A specific slave within a group is selected by specifying its
address in the Station address area (hexadecimal). When the
Station address value is set to 7Fh, all slaves assigned to the
group(s) are selected.
Entering the value 00h in the Group select area of IR n+1 selects
all groups. Therefore any single slave can be addressed by
entering 00h for Group select and the station address of the slave
for Station address. This also enables to address a slave that has
not been assigned to a certain group.
A broadcast command to all slaves is generated by entering the
values 00h for Group Select and 7Fh for Station Address.
Example: The first table shows an example of the assignment of
the slaves to groups as made with the configurator.
Stations Group assignment
02h ~ 20h no group
21h ~ 40h group 1
41h ~ 60h group 2
61h ~ 80h group 1 and group 2
The second table shows some examples of settings
for Group select and Station address, and the
resulting selection of slaves that will be targeted by a
control command.
Group select Station address
00h
01h
01h
03h
00h
Section 5-3
Selection
15h slave 15h
75h slave 75h
15h -
7Fh slave 21h ~ 80h
7Fh slave 02h ~ 80h
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