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88
Allocated CIO Area Words
Section 4-2
4-2-2
Global_Control Message (Word n+2)
A PROFIBUS Global_Control message can be transmitted by the Unit on user
demand to either
Global_Control Multicast
command
• one or more groups of slave stations allocated to the PROFIBUS-DP
Master Unit (Multicast command), or
Global_Control Broadcast
command
• all slave stations allocated to the PROFIBUS-DP Master Unit (Broadcast
command).
The number of the group to which each slave station belongs, is defined in its
parameterization message. Only the slave stations assigned to the groups to
which the Global_Control message is addressed will process the command.
Group address setting
The group address to send the message to is specified in bit 00 though bit 07.
Selecting specific groups of slave stations (i.e. a Multicast command),
requires setting of one or more bits in this range to ON. Selecting all slaves
(i.e. a Broadcast command) requires all bits in this range to be set to OFF.
The Global_Control command flags are specified in the bit 10 through bit 13.
Transmitting the message is done by setting the Transmit Global Control
message switch, bit 04 in CIO Word n, see
4-2-1 Software Switches 1 (Word
04
Transmit
Global_Control
message
OFF
→
ON
User
Upon setting this switch the Unit will transmit one Global_Control mes-
sage over the network. The contents of the message is defined in CIO
Word n+2, see
4-2-2 Global_Control Message (Word n+2).
OFF
Unit
The bit will be turned OFF by the Unit if the Global_Control message
has been transmitted.
05
to
07
Reserved by sys-
tem
---
---
These bits are ignored in the Unit. If set, they will be immediately
returned to OFF.
08
Clear new diagnos-
tics bits
OFF
→
ON
User
Upon setting this switch the Unit will clear all new diagnostics bit flags in
CIO Word n+17 to n+24. These bits indicate reception of new slave
diagnostics data.
Clearing the bit flags provides a clear indication for new messages to
arrive.
OFF
Unit
If the bit flags have been cleared, the Unit will reset this bit to OFF.
09
to
15
Reserved by sys-
tem
---
---
These bits are ignored in the Unit. If set, they will immediately be set to
OFF by the Unit.
Bit
Name
Status
Controlled
by
Unit operation
Summary of Contents for SYSMAC CJ1W-PRM21
Page 2: ...iv...
Page 36: ...22 Basic Operating Procedure Section 1 5...
Page 52: ...38 Defining PROFIBUS DP in the Software Section 2 5...
Page 112: ...98 Allocated CIO Area Words Section 4 2...
Page 122: ...108 Command Response Reference Section 5 2...
Page 160: ...146 Replacing the Unit Section 7 8...
Page 174: ...160 Appendix...
Page 180: ...166 I O Data Conversions Appendix D...
Page 186: ...172 Configurator Error and Warning Messages Appendix E...
Page 187: ...173 Index...
Page 188: ...174 Index...
Page 190: ...176 Revision History...