Intelligent Dp Slaves (I-Slaves); I-Slave Functionality - Siemens SIMATIC ET 200AL System Manual

Functions

5.5 Intelligent DP slaves (I-slaves)

Additional information
A detailed description of the events at which interrupts are triggered is available in the
documentation of the respective manufacturer of the DPV1 slave.
5.5 Intelligent DP slaves (I-slaves)
5.5.1

I-slave functionality

I-slave functionality
The "I-slave" (intelligent DP slave) functionality of a CPU supports the exchange of data with
a DP master and thus allows the CPU to be used, for example, as intelligent preprocessing
unit of subprocesses. The I-slave is connected in its role as DP slave to a "higher-level" DP
master.
The preprocessing is handled by the user program in the I-slave. The process values
acquired by the I/O modules are preprocessed by the user program and made available to
the DP master.
Figure 5-12 I-slave functionality
"I-slave" naming convention
In the remainder of this description, a CPU or a CP with I-slave functionality is simply called
an "I-slave".
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