Configuring The Profibus Master; Fdt/Dtm Technology - Omron CJ Series Operation Manual

1 Features and System Configuration
 Auto-Clear and Fail-safe State
If an error occurs during the data exchange phase of the master, the 'Auto-CLEAR' function deter-
mines the subsequent actions. If this function has been disabled, the master remains in the OPER-
ATE mode. If the function has been enabled, the master automatically changes the network to the
CLEAR mode, in which the outputs of the assigned PROFIBUS DP slaves are switched to zero, i.e.
the 'fail-safe' state. The master continues to read the inputs of the slaves.
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Configuring the PROFIBUS Master

In order to operate a PROFIBUS network, each master in the network needs to be configured. This pro-
cess of configuration involves:
• setting up the network topology, i.e. assigning the slave devices with which the master will be
exchanging data
• defining the parameterization data, which the master will send to each of the slave devices, before
process data exchange can commence
• defining the configuration data, i.e. defining the process data, which will be exchanged
• setting up the bus parameters, which define the baud rate and the bus timing parameters
• downloading the configuration setup to the master device
 Configuration Technology
The configuration process is usually facilitated by a special Computer based program, often referred
to as a configurator. The configurator requires special configuration files, defining the configuration
options for each device, which is to participate in data exchange. The files must be provided by the
manufacturer of the device.
Two types of configuration technology exist:
• Configuration technology based on FDT/DTM technology
• Configuration technology based on GSD-files
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FDT/DTM Technology

 FDT/DTM Technology
The newer configuration tools are based on FDT/DTM technology.
 FDT/DTM Concept
The FDT/DTM concept specifies the interfaces between the engineering systems called Field
Device Tools (FDT), and the device-specific software components called Device Type Managers
(DTM).
The FDT/DTM concept separates the device dependent functionality (which is in the DTM) from the
application. It provides separate interfaces for device configuration, monitoring and maintenance
solutions, which before largely depended on the manufacturer of the application. Because of this
concept, FDT/DTM technology is not limited to PROFIBUS applications. In concept, any type of net-
work can be configured and accessed, provided the appropriate DTMs are available.
 FDT Container Application
A FDT container application facilitates configuration of network devices and parameterizing and/or
manipulating their operational modes. All device dependent functionality is concentrated in the
DTM.
1-8 CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)