Siemens SIMATIC ET 200AL, System Manual

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PROFIBUS with STEP 7 V13
10
Function Manual, 12/2014, A5E03775446-AC
Description
2
2.1 Introduction to PROFIBUS
What is PROFIBUS?
PROFIBUS is a bus system that networks automation systems and field devices that are
compatible with PROFIBUS. As communication medium for the field level, PROFIBUS is an
important part of Totally Integrated Automation (TIA).
The different communication networks can be used independent of one another or they can
be combined with each other.
PROFIBUS protocols
PROFIBUS DP (distributed I/O) is a communication network for the field level according to
IEC 61158-2 / EN 61158-2 with the hybrid access protocols token bus and master-slave. The
networking takes place by means of two-wire lines or fiber-optic cables. Data transmission
rates of 9.6 kbps to 12 Mbps are possible.
PROFIBUS PA is the PROFIBUS for process automation (PA). It connects the
PROFIBUS DP communication protocol with the MBP (Manchester Bus Powered)
transmission technology to IEC 61158-2.
PROFIBUS PA networks can be designed based on shielded, twisted two-wire lines
intrinsically safe and are therefore suitable for hazardous areas (Ex zones 0 and 1). The data
transmission rate is 31.25 kbps.