Configuring Hardware and Communication Connections STEP 7.pdf

3.4.2 Configuration with Intelligent DP Slaves
(Data Exchange: I Slave Master)
Configuring the Distributed I/O (DP)
You can divide automation tasks into subtasks that can be controlled by a higherlevel
programmable logic controller. These control tasks, which can be
accomplished independently and efficiently, run as preprocessing on a CPU. This
CPU can be implemented in the form of an intelligent DP slave.
For configurations with intelligent DP slaves (I slaves), such as a CPU 315-2DP,
the DP master does not access the I/O modules of the intelligent DP slave; instead,
the master accesses only the address areas of the CPU of the I slave. This means
that this address area cannot be assigned for real I/O modules in the I slave. This
assignment must be made when the I slave is configured.
Examples of intelligent DP slaves (= DP slaves with preprocessing): station with
CPU 315-2DP, CPU 316-2DP, CPU 318-2DP
Configuring Hardware and Communication Connections with STEP 7
A5E00706939-01 3-7