Siemens SIMATIC ET 200AL - I-Slave Functionality; Intelligent DP Slaves (I-Slaves)

Functions
5.5 Intelligent DP slaves (I-slaves)
PROFIBUS with STEP 7 V13
78 Function Manual, 12/2014, A5E03775446-AC
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".