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PROFIBUS-DP and PROFIdrive
Page 21
PROFIBUS-Manual Servo positioning controller DIS-2 48/10 FB
Version 2.0
4
PROFIBUS-DP and PROFIdrive
4.1
Overview of DP and its different versions
The DP communication protocol (DP = decentralized peripherals) is intended for quick data exchange
on the field level. On this level, central automation devices, such as PLC, PC or process control
systems communicate via a quick serial connection with decentralized field devices, such as I/O
devices, drives, valves, measuring transducers and analysis devices. Data exchange with the
decentralized devices is mainly cyclic. The required communication functions are defined by the DP
basic functions (version DP-V0).
To meet special requirements of different areas of application, the basic functions of DP were
extended and special functions were added so that now three versions of DP, i.e. DP-V0, DP-V1 and
DP-V2, are available. Every version has a special main focus. They can be described as follows:
DP-V0
This version offers the basic functionality of DP, such as cyclic data exchange
and station-, module- and channel-specific diagnosis.
DP-V1
This version includes extensions for process automation like, for example,
acyclic data exchange for parameterisation, operation, monitoring and alarm
management of intelligent field devices in parallel to cyclic exchange of useful
data. Bus devices can be accessed online through engineering tools. In addition,
DP-V1 includes alarms like the status alarm, the update alarm and a
manufacturer-specific alarm.
DP-V2
This version includes further extensions and is mainly intended to meet the
requirements of drive applications. Additional functions such as, for example,
isochronous slave operation and slave-to-slave communication allow DP-V2 to
be used as a drive bus for controlling quick sequences of motion in drive shafts.
This version requires special hardware. At present, the control systems and
target applications of the servo positioning controller DIS-2 48/10 FB is not
equipped with this hardware. This is why support of DV-V2 is not intended.
The versions of DP are specified in detail in IEC 61158 (see
chapter 1.2 PROFIBUS documentation
).
Every DP system comprises different types of devices. Three types can be distinguished: DP master
class 1, DP master class 2 and DP slaves. DP can be used to realize mono- and multi-master systems
and thus offers a high level of flexibility for system configuration. A maximum of 126 devices (masters
or slaves) can be connected to the bus.