Interfaces, Networks and Data Communication for the S7-400
5-7
Automation System S7-400 Configuration and Use
A5E0044271 1-02
DP slaves
Numerous stations are available as DP slaves, for example:
• Distributed I/O from the ET 200 series
• Drives (power converters, frequency converters)
• CNC controllers
• Standard slaves from other manufacturers
Characteristics of PROFIBUS DP
Table provides you with an overview of the characteristics of the PROFIBUS DP.
Table 5-2 Characteristics of PROFIBUS DP
Connectable devices Field devices such as drives, valves,
distributed I/O
Maximum number of slaves 125
Maximum data volume per slave 244 bytes inputs, 244 bytes outputs
Transfer rates 9.6 Kbps to 12 Mbps
Typical reaction time 1 ms (at 12 Mbps and 16 DP slaves)
Transmission medium Shielded two-wire cables or
fiber-optic cables (glass or plastic)
Distance Two-wire cable: 9.6 km
Fiber-optic cable: 23.8 km
Typical degree of protection for the slave
module
IP20 to IP67
Standard PROFIBUS according to IEC 61158 /
IEC 61784-1:2002 Ed1 CP 3/1
Access to Distributed I/O
I/O is addressed via PROFIBUS DP as easily as the central I/O in the CPU.
The distributed I/O modules have the same functions as the modules connected
directly to the central rack, for example:
• You can trigger diagnostic interrupts.
• You can trigger process interrupts.
• You can assign parameters with the user program.
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