ILX69-PBM ♦ CompactLogix™ or MicroLogix™ Platform
Communication
PROFIBUS Master Communication Module
User Manual
ProSoft Technology, Inc.
Page 77 of 113
Group_Select
The GS parameter allows the user program to select up to 8 possible slave groups to
address by this service. This command is activated in the slave when the AND linkage
between its internal Group_Ident and the desired Group_Select logic result is a '1'. The
Group_Ident parameter is configured by the master during the startup phase.
If the Group_Ident pa
rameter is set to a value of ‘0’, the slave does not carry out a group
evaluation (AND linkage) with the received command.
The Global Control Command is processed by using the two handshake bits
GlbCtrlReq
in the Device Command register and
GlbCtrCnf
in the Device Status register. The
command is sent on every High to Low
and
Low to High transition of the
GlbCtrlReq
bit.
If both bits are equal, a command can be sent.
To send a command, configure the Global_Control_array with the desired command. Set
the bits
GlbCtrlReq
and
GlbCtrlCnf
to unequal by transition of the
GlbCtrlReq
bit. If the
GlbCtrlCnf
was set equal to the
GlbCtrlReq
bit, the command was sent. The table below
provides an explanation of this process.
GlbCtrlReq GlbCtrlCnf Description
0
0
No Control_Command is active. The next command can be sent.
1
0
Control command in progress
1
1
No Control_Command is active. The next command can be sent.
0
1
Control command in progress
0
0
Process repeats
PROFIBUS Output Data
Bytes 16 to 495 is used for PROFIBUS output data sent to the slaves. The output
information is transferred from the controller to the module. Output data from the
PROFIBUS system starts at the 16th byte (based on Start Index 0) in the output region.
Thus, the module has a maximum of 480 bytes output data for slave devices. The output
data of the slaves are arranged in this area according to the I/O mapping table assigned
by ProSoft fdt Configuration Manager. ProSoft fdt Configuration Manager is able to
configure more than 480 bytes of output data, up to 5760 bytes. Should the output data
be greater, the module and the sample ladder logic (AOI) will page the data until all the
PROFIBUS Output data has been transferred.
