PLC Programming

PLC Configuration
6.5.5 Configuration of a Channel
Base parameters of a channel
Basisparameter dialog for a channel
Channel-Id: Globally unique identifier of the channel
Class: Defines whether the channel is used als input (I), output (Q), or as input and output (I&Q), or
whether it is switchable (I|Q). If the channel is switchable, this can be done by the command 'Extras'
'Replace element'.
Size: Size of the channel [Byte]
Default identifier: Symbolic name of the channel
The name of the channel is defined in the configuration file. Only if it is allowed by the definition of the
father module, the name of the channel can be edited in the configuration tree.
Comment: Additional information on the channel
In the edit field a comment can be inserted or modified.
Address: This edit field only will be available if it was activated by an entry in the configuration file.
Insert the desired address for the channel.
Channel parameters
Bitchannels
Corresponding to the Moduleparameter dialog the Channelparameter dialog is used to display and
modify the parameters of a channel: Index, Name, Wert, Default, Min., Max. This dialog also can be
replaced by a customer specific dialog 'Custom Parameters' ersetzt sein.
Bitchannels are automatically inserted, when a channel is defined with an entry
CreateBitChannels=TRUE in the configuration file.
The Basisparameter dialog of bitchannels just contains the field Comment.
6.5.6 Configuration of Profibus Modules
CoDeSys supports a hardware configuration corresponding to the profibus DP standard. In the
profibus system you find master and slave modules. Each slave is provided with a parameter set by
ist master and supplies data on request of the master.
A PROFIBUS DP system consists of one or several masters and their slaves. First the modules must
be configured so that a data exchange over the bus is possible. At the initialization of the bus system
each master parameterizes the slaves which are assigned to it by the configuration. In a running bus
system the master sends and/or requests data to/from the slaves.
6-18 CoDeSys V2.3