Description
2.1 Introduction to PROFIBUS
PROFIBUS with STEP 7 V13
12
Function Manual, 12/2014, A5E03775446-AC
Objectives of PROFIBUS DP
Distributed automation systems are increasingly used in production and process automation.
This means a complex control task is divided up into smaller, more transparent subtasks with
distributed control systems. This creates a high demand for communication between the
distributed systems.
Distributed systems offer the following benefits:
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Independent and simultaneous commissioning of individual devices is possible
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Small, manageable programs
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Parallel processing due to distributed automation systems
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Reduced response times
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Higher-level structures can take on additional diagnostics and logging functions.
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Increased plant availability because the rest of the overall system can continue to work
when a subordinate station fails.
2.1.2
PROFIBUS terminology
Definition: Devices in the PROFIBUS environment
In the PROFIBUS environment, "device" is the generic term for:
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Automation systems (for example, PLC, PC)
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Distributed I/O systems
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Field devices (for example, hydraulic devices, pneumatic devices)
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Active network components (e.g., diagnostic repeater, optical link module)
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Gateways to AS interface or other fieldbus systems
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