Characteristics Of Profibus Dp - Siemens SIMATIC S7-400 Configuration And Use Manual

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
Connectable devices
Maximum number of slaves
Maximum data volume per slave
Transfer rates
Typical reaction time
Transmission medium
Distance
Typical degree of protection for the slave
module
Standard
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.
Automation System S7-400 Configuration and Use
A5E00442711-02
Interfaces, Networks and Data Communication for the S7-400
Characteristics of PROFIBUS DP
Field devices such as drives, valves,
distributed I/O
125
244 bytes inputs, 244 bytes outputs
9.6 Kbps to 12 Mbps
1 ms (at 12 Mbps and 16 DP slaves)
Shielded two-wire cables or
fiber-optic cables (glass or plastic)
Two-wire cable: 9.6 km
Fiber-optic cable: 23.8 km
IP20 to IP67
PROFIBUS according to IEC 61158 /
IEC 61784-1:2002 Ed1 CP 3/1
5-7