ProSoft Technology ILX69-PBM - Manual (Page 81)

ILX69-PBM ♦ CompactLogix or MicroLogix Platform Contents
PROFIBUS Master Communication Module User Manual
ProSoft Technology, Inc. Page 81 of 124
February 4, 2015
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 parameter 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.