SIEMENS
2/7
Siemens D 35 · 2017
2
Communication
PROFIBUS
■
Overview
PROFIBUS – the proven, rugged bus system for automation
engineering applications
The requirements of users for an open, non-proprietary
communication system have resulted in the specification and
standardization of the PROFIBUS protocol.
PROFIBUS defines the technical and functional features of a
serial fieldbus system, with which the distributed field automa-
tion devices in the lower area (sensor/actuator level) can be
网络上升到中期性能范围（单元格级）。
Standardization according to IEC 61158/EN 50170 secures your
investments for the future.
Using the conformity and interoperability test performed by the
test laboratories authorized by PROFIBUS & PROFINET
国际（PI）和PI，用户的设备认证
have the security of knowing that the quality and functionality is
guaranteed, even in multi-vendor installations.
PROFIBUS versions
Two different PROFIBUS versions have been defined in order to
comply with the widely varying requirements at field level:
•
PROFIBUS PA (P
rocess A
utomation） - 应用程序的版本 -
tions in process automation. PROFIBUS PA uses the intrinsi-
cally safe transmission technology specified in IEC 61158-2.
•
PROFIBUS DP (D
分数P.
eriphery) – this version, which is
optimized for speed, is specifically tailored to the communi-
cation of automation systems with distributed I/O stations and
drives. PROFIBUS DP sets itself apart as a result of very short
response times and high noise immunity, and replaces cost-
intensive, parallel signal transfer with 24 V and measured
value transfer utilizing 0/4 … 20 mA technology.
■
Design
Bus participants on PROFIBUS DP
PROFIBUS DP makes a distinction between two different master
课程和一个奴隶类：
DP master class 1
For PROFIBUS DP, DP master class 1 is the central component.
在定义和连续的重复消息周期中
central master station exchanges information with distributed
stations (DP slaves).
DP master class 2
Devices of this type (programming, configuring or operator
control devices) are used during commissioning, for configuring
DP系统，用于诊断或用于操作活性植物
or system. A DP master class 2 can, for example, read input,
output, diagnostic and configuration data of the slaves.
DP slave
A DP slave is an I/O device which receives output information or
setpoints from the DP master, and as response, returns input
information, measured values and actual values to the
DP master. A DP slave never sends data automatically, but only
当DP Master请求时。
The quantity of input and output information depends on the
设备,为每一个在每个发送directi DP的奴隶on can be a
maximum of 244 bytes.
■
Function
Functional scope in DP masters and DP slaves
The functional scope can differ between DP masters and DP
slaves. The different functional scopes are classified as DP-V0,
DP-V1 and DP-V2.
DP-V0 communication functions
The DP-V0 master functions consist of "Configuration",
"Parameter Assignment" and "Reading Diagnostics Data", as
well as cyclic reading of input data/actual values and writing
output data/setpoints.
DP-V1通信功能
The DP-V1 function expansions make it possible to perform
无循环读写功能以及处理循环
data communication. This type of slave must be supplied with
extensive parameterization data during start-up and during
normal operation. These acyclically transferred parameteriza-
tion data are only rarely changed in comparison to the cyclic
设定值，实际值和测量值，并且是跨
ferred at lower priority in parallel with the cyclic high-speed user
data transfer. Detailed diagnostic information can be transferred
in the same way.
DP-V2 communication functions
The extended DP-V2 master functions mainly comprise
functions for isochronous operation and slave-to-slave
DP奴隶之间的通信。
•
Isochronous mode:
通过等距来实现同步模式
signal in the bus system. This cyclic, equidistant clock signal
is sent by the DP master to all bus nodes in the form of a global
control frame. Master and slaves can then synchronize their
使用此信号的应用。循环之间的信号抖动
is less than 1
μ.
s.
•
Slave-to-slave communication:
The "publisher/subscriber" model is used to implement slave-
to-slave communication. Slaves declared as publishers make
它们的输入数据/实际值和测量值可用
对于其他奴隶，订阅者，阅读。这是由
将响应帧发送到主站作为广播。
Slave-to-slave communication is therefore a cyclic process.
■
Integration
PROFIBUS with SINAMICS
SINAMICS uses the PROFIBUS DP protocol. SINAMICS drives
只能用作DP奴隶。
G_PM10_XX_00144
© Siemens AG 2017