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Product Overview
What are DP Masters and DP Slaves?
The link between the control CPU and the distributed I/O devices is the DP master.
The DP master exchanges data over PROFIBUS-DP with the distributed I/O
devices and monitors PROFIBUS-DP.
The distributed I/O devices (= DP slaves) prepare the data of the encoders and
actuators locally so that they can be transferred to the control CPU over
PROFIBUS-DP.
Which Devices Can Be Connected to PROFIBUS-DP?
A wide variety of devices can be attached to PROFIBUS-DP as DP masters or DP
slaves providing they operate in compliance with the IEC 61158/EN 50170 ,
Volume 2, PROFIBUS standard. These include the devices of the following product
families:
• SIMATIC S5
• SIMATIC S7/C7
• SIMATIC programming devices/PCs
• SIMATIC HMI (operator control and monitoring devices OP, OS, TD)
• Distributed I/O devices
• Devices from other vendors
Structure of a PROFIBUS-DP Network
The schematic below illustrates the typical structure of a PROFIBUS-DP network.
The DP master is integrated in the relevant device, for example the S7-400 as a
PROFIBUS-DP interface. The ET 200iS distributed I/O stations are connected to
the DP master over PROFIBUS-DP Ex i and PROFIBUS DP.
PROFIBUS-DP
Figure 2-1 Typical Structure of a PROFIBUS-DP Network
2-2
S7-400
Fieldbus isolating transformer
Terminating resistor
PROFIBUS-DP Ex i
ET 200iS
Hazardous area: zone 1
PG/PC
S7-300
Hazardous area: zone 2
ET 200iS Distributed I/O Station
ET 200iS
A5E00087831-02
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