4 Data Exchange with the CPU Unit
4-12
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Global-Control Multicast Command
One or more groups of slave devices allocated to the PROFIBUS Master Unit (Multicast command).
Global-Control Broadcast Command
All slave devices allocated to the PROFIBUS Master Unit (Broadcast command).
The number of the group to which each slave device belongs, is defined in its parameterization mes-
sage. Only the slave devices assigned to the groups to which the Global-Control command is
addressed will process the command.
Group Address Setting
The group address to send the message to is specified in *_GlobCtlGrp1 through *_GlobCtlGrp8.
Selecting specific groups of slave devices (i.e. a Multicast command), requires setting of one or
more bits in this range to TRUE. Selecting all slaves (i.e. a Broadcast command) requires all bits in
this range to be set to FALSE. The Global-Control command flags are specified in
*_GlobCtlUnfreezeCmd, *_GlobCtlFreezeCmd, *_GlobCtlUnsyncCmd and *_GlobCtlSyncCmd.
Transmitting the message is done by setting the Transmit Global-Control command
switch,*_GlobCtlTxCmd, see 4-2-1 Software Switches (*_SwCmd).
Device Variables for CJ-series Unit separating functions per each switch contained in Global-Control
command are shown below.
1514131211109876543210
*_GlobCtlCmd
*_GlobCtlGrp1
*_GlobCtlGrp2
*_GlobCtlGrp3
*_GlobCtlGrp4
*_GlobCtlGrp5
*_GlobCtlGrp6
*_GlobCtlGrp7
*_GlobCtlGrp8
Gr o u p sel ect :
*_GlobCtlUnfreezeCmd
*_GlobCtlFreezeCmd
*_GlobCtlUnsyncCmd
*_GlobCtlSyncCmd
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