Siemens SIMATIC ET 200AL, System Manual

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PROFIBUS with STEP 7 V13
42
Function Manual, 12/2014, A5E03775446-AC
Parameter assignment/addressing
3
To set up an automation system, you will need to configure, assign parameters and link the
individual hardware components. The work needed for this is undertaken in the STEP 7
device, topology and network view.
Configuration
"Configuring" is understood to mean arranging, setting and networking devices and modules
within the device or network view.
A PROFIBUS address is automatically assigned to each module. The addresses can be
subsequently modified.
The CPU compares the preset configuration created in STEP 7 with the actual configuration
of the plant. Errors can be detected and signaled immediately this way.
The exact procedure for configuring devices is described in detail in the STEP 7 online help.
Parameter assignment
"Parameter assignment" is understood to mean setting the properties of the components
used. The settings for the hardware components and for data exchange are assigned, for
example, activating diagnostics, input delay with DI.
The parameters are downloaded into the CPU and transferred to the corresponding modules
when the CPU starts up. Modules can be replaced with ease because with SIMATIC CPUs
the set parameters are automatically downloaded into the new module during each startup.
Adjusting the hardware to the project requirements
You need to adapt the hardware if you want to set up, expand or change an automation
project. To do this, add hardware components to your layout, link them with existing
components, and adapt the hardware properties to the tasks.
The properties of the automation systems and modules are preset so that in many cases you
do not have to assign parameters again.
But parameter assignment is required in the following cases:
●
You want to change the preset parameters of a module.
● You want to use special functions.
● You want to configure communication connections.