10
PROFIBUS-DP Master Unit
Section 1-3
can be distributed over up to two input areas and 2 output areas. Each of the
input and output areas can be mapped to any location in the DM Area, CIO
Area, WR Area, HR Area, or the EM banks.
FINS messages The PROFIBUS-DP Master Unit supports FINS message exchange with the
PLC CPU to allow the transfer of Slave diagnostics data, or the Error log.
Also, the user can enable or disable communication with specific allocated
slave stations, so that they can temporarily be taken out of the network for
maintenance, without the PROFIBUS-DP Master Unit reporting an error.
PROFIBUS-DP functions The PROFIBUS-DP Master Unit supports all mandatory services defined in
the PROFIBUS-DP standard EN50170, Volume 2 for Master - Slave Commu-
nication. These functions includes the following services:
• Set_Prm
• Chk_Cfg
• Slave_Diag
• Data_Exchange
• Global_Control (FREEZE, UNFREEZE, SYNC, UNSYNC, CLEAR)
The PROFIBUS-DP Master Unit supports cyclic Master - Slave communica-
tions for networks with up to 125 Slave stations. With each Slave station it can
exchange up to 244 bytes of input data and up to 244 bytes of output data.
For diagnostics purposes the PROFIBUS-DP Master Unit collects all Slave
Diagnostics messages, which it can be transferred to the PLC memory, using
FINS commands. From every allocated Slave station it can receive up to 244
bytes of diagnostics data.
Configuration Before the PROFIBUS-DP Master Unit can control the PROFIBUS network, it
must be configured, using the dedicated configuration program CX-Profibus.
Without this configuration, the Unit will not be able to achieve data exchange.
The Configurator is explained in section
1-4 CX-Profibus Configurator
Troubleshooting
Functions
The PROFIBUS-DP Master Unit is provided with a variety of troubleshooting
functions for prompt recovery in case of errors:
• Extensive self-diagnostic function at startup
• Data exchange flags, indicating if I/O data is being exchanged with the
slave stations
• Diagnostics flags, indicating if new Slave diagnostics data is available
• Extensive status and error flags, indicating the status of the Unit and the
PROFIBUS network
• Error log for recording error history data
1-3-2 Specifications
PROFIBUS-DP Master Unit Model
General Specifications General specifications of the CS/CJ-series PROFIBUS-DP Master Units con-
form to the general specifications for the SYSMAC CS/CJ-series CPU Units.
Applicable PLC Unit classification Types of communications Model number
CS Series CPU Bus Unit • Remote I/O communications master CS1W-PRM21
CJ Series CJ1W-PRM21
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